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You put a lot at risk by leaving the house without a portable charger or battery pack. Once your smartphone dies, you can't call, text, or tweet, rendering you disconnected from friends and family. And if you're taking any sort of transit home, do you really want to go without your songs and podcasts, and endure listening to the conversations of others? One charger can even deliver enough energy to satisfy the power-hungry Nintendo Switch, which charges over USB Type-C, while another -- that resembles a golf club -- doubles as a Bluetooth speaker.

Most tablets require at least 1A to charge too, with some drawing up to 2.5A. Take the Apple iPad Air for example, which comes with a 12W USB wall adapter that provides 2.4A. If you were to plug the iPad Air to a battery pack’s 1A USB port, it’ll either not charge or charge super slowly. So if you’re looking to charge a tablet, our advice is to buy a battery pack that’s capable of outputting higher than 1A (at least 1.5A if you’ve an Android tablet, and 2.1A if you’ve an iPad). Lastly, there’s no harm using a higher-powered port on a smartphone, as the device only draws what is required. In fact, it may even charge faster if it’s able to draw more.

20,100 mAh of battery power comes in handy for either multiple charges or multiple devices. Anker says that’s enough to charge an iPhone 7 nearly seven times, an iPhone 7 Plus four-and-a-half times, an iPad Air 2 one-and-a-half times or an iPad mini 4 twice. The PowerCore 20100 also comes with two USB outputs so you can charge two devices simultaneously.

It also has four LED indicators on the top right to show you the remaining battery. A proper display would be nice, but it’s sufficient here. Even one LED light means you can still get one full charge left out of the iPhone 7 Plus.

At $39.99, the PowerCore 20100 is an absolute steal. It shows too. Out of over 7,000 ratings on Amazon, it has a 4.7 out of 5 star average.

The above aspects and other aspects of this disclosure are described below in greater detail with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015]

FIG. 2 is a block diagram of a portable smart battery booster with an integrated internal battery pack where the output voltage is changed via software;
[0017]

As an iPhone and iPad portable charger, Power Bank is a large but high capacity option with standout features like its LED indicator and strong build quality. As a solution for powering the 12-inch MacBook, Power Bank can charge a resting notebook or help keep your very active machine alive in a pinch. A higher powered solution like the recently reviewed ChargeAll Portable Power Outlet may be more appropriate for frequent heavy usage on even a 12-inch MacBook away from a real power supply for now.

This disclosure describes several different embodiments of a battery booster. The disclosed embodiments are intended as examples and other embodiments can take various and alternative forms. The figures are not necessarily to scale and some features may be exaggerated or minimized to show details of particular components. The specific structural and functional details of the examples specifically disclosed are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art how to make and use the present invention. The features illustrated and described with reference to any one of the figures can be combined with features illustrated in one or more other figures to produce embodiments that are not explicitly illustrated or described.
[0021]

FIG. 1 is a block diagram of a portable smart battery booster 110 with an integrated internal battery pack 120 that may be a single rechargeable cell, or a plurality of rechargeable cells configured in series, parallel or some combination thereof. The battery or plurality of battery cells has a cell voltage which can vary (e.g. 3.7 volts for a Lithium-ion battery, 1.5 volts for a Nickel-Metal Hydride). The portable power apparatus 110 includes hardware that changes an output voltage 130 to a desired output voltage selected from a plurality of available predetermined output voltages which may be different than the cell voltage. The output may be at a voltage level higher than the battery pack 120 voltage, or the output voltage 130 can be a voltage less than the battery pack 120 voltage. Charge power 140 is supplied to the battery pack 120 by a charge circuit 150. The charge circuit 150 controls the voltage and current applied to the battery pack 120 based on the charge power 140 available and the battery pack 120 state of charge. The charge circuit 150 may consist of a buck or boost converter that generates the required voltage and current. A DC/DC converter circuit 160 converts the battery pack 120 voltage to the desired output voltage 130. The output circuitry may include the DC/DC converter circuit 160 which may include a feedback mechanism 170 that monitors the output voltage 130. The feedback mechanism 170 increases or decreases the output voltage 130 supplied by the output circuitry to maintain the voltage at the preferred voltage level.
[0022]

1 x Battery pack
1 x USB to Micro USB cable

Capacity.

Emergency chargers usually range in capacity from 500 to 2600 mAh. To charge the average smartphone to 70-90% capacity, you need 2600 mAh. So, a 500-1000 mAh charger will give you a “boost” if you are navigating somewhere, on an important call on the way to your hotel, and your battery is about to die. Depending on how far you are from a charging source, it might help you, providing your battery hasn’t already died. We recommend 1000 mAh for a boost. A tablet or iPad requires on average 5000-6500 mAh, and you need a 2.1 Amp USB port. Now you are into a power bank, not just a charger. Higher capacity power banks give you the ability to charge your phone and iPad or multiple devices before the battery must be recharged. All can be recharged by a USB cord in your laptop and some can be charged directly in an AC wall outlet. Great for someone who travels.

The USB port on this battery will provide MacBooks with an output of 5 volts while the DC voltage output is around 15-24 volts. It uses Li-ion Panasonic cells, with overcharge and discharge circuits included for device protection. The main DC output port is compatible with all Apple MacBook Air series, MacBook Pro series and any other MacBook series. If you’re looking for a size bigger than 40,000mAh, Lizone has you covered here.

Features.

it works just fine. I was planning on taking an extra one of those batteries and make sure it was fully charged to make sure that this experiment went without a hitch.... I forgot. The battery was discharged yesterday to test a charger, but we didn't get around to fully charging the battery again. The battery is now at 3.7V, and the 'pi runs just fine. It has connectivity over the ethernet, my "HDMI->VGA" dongle will not work because it requires something closer to 5V. Similarly USB devices might not work, as they too require something closer to 5V. But for me, this construction is just fine. (I spent 5 minutes typing this: uptime is now 11min).
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To be fair, power banks aren't sold for this purpose. The data sheet linked above for the actual batteries shows they don't output 5V and don't really output a very consistent voltage at all, which is how batteries usually are -- go check a 1.5V battery that's been in use for a while with a multimeter. Even though it probably works in context, it isn't outputting 1.5V anymore. It works because battery based devices either don't really depend on a consistent voltage (e.g., flashlights, which just get dimmer) or they have some kind of onboard power regulation to compensate.

The Raspberry Pi is not a battery based device and will not help you with this issue.

To make a total guess as a electronics neophyte, I'd say likely the four batteries in that pack are all in parallel and the voltage is stepped up (making the claim that it is a 21200 mAh battery pack subject to the caveat that it won't, at 5V, put out 1A for 21.2 hours).

I believe a problem with stepping voltage up is it costs you current. Current output from batteries isn't regulated at all, meaning you can actually draw a lot (very quickly draining the battery), so that is not such a big deal, but to protect attached USB devices, a USB power pack also has to regulate current. Combine this with the fact that it is stepping up the battery voltage and you have something that, unless intended to do so, may not deal well with things that have sudden spikes in current draw. Things that are being recharged (i.e., other batteries) won't do that, but things that are being powered directly (the Pi's CPU) will.

When you're out camping or on tour, one of the main concerns is charging your iPhone. Obviously, the outdoors is a hard place to find charging points. That's why power banks for the iPhone make a lot of sense – and are almost mandatory gadgets for touring, camping and traveling folk.

There are millions of portable chargers for the iPhone out there. Almost many of them are pretty good, come with a decent lifetime and recharge cycle and have good specs. Here's a collection we rounded up. [Check out the latest list

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Second, ports. The Nintendo Switch has a USB-C port, but that doesn’t mean that your power bank has to have one.
You can use a USB-A to USB-C cable to connect the Switch to a power bank, but note that in the vast majority of cases the maximum output of a USB-A port on a power bank will be 2.4A.
You are more likely to find 3A output with a USB-C port, and in which case you may find a USB-C to USB-C cable offers a faster way of charging the Switch.

We think the PowerCore 20100 is a happy medium. It’s just slightly taller than an iPhone 7 Plus and about two-thirds the width. It’s admittedly much thicker, but takes up the same surface area and isn’t heavy for its size. You should have no problem slipping this in almost any bag or suitcase wherever you head. It comes with a handy carrying case as well.

Most smartphone-oriented battery packs output at most 1A (at 5V) over the USB port. While this works fine for most people, some may notice that their smartphone now takes a longer time to recharge as compared to when a wall charger is used. This is especially true if the phone is able to accept a higher current. Many recent Android smartphones have a 1.5A charging interface, and those which support Qualcomm’s Quick Charge 2.0 standard (e.g. LG G2) can draw as much as 2A. So, manage your expectations.

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Still, Power Bank does provide several hours of extra MacBook usage without being tethered to a wall outlet and proves a competitive option at its $49.90 Amazon price. Vinsic Ultra Slim Power Bank can be had for even less at $45 for 9to5Mac readers using the code 5KMRPQYR at checkout when purchasing one or more Power Banks on Amazon through Friday.

FIG. 3 is a block diagram of the energy flow from a AC or DC power source to the portable smart battery booster, and then to the smart device;
[0018]

20000mAh Power Bank - Fully charge your iPhone 7 Plus 4.5 times or a Galaxy S7 Edge 3.5 times, or a Google Nexus 6P 3.5 times or a 9.7-inch iPad Pro 1.5 times
Dual USB ports, combined 3.1A output - Simultaneously charge your smartphone and tablet at max speed
AiPower - Tuned to adaptively provide the safest maximum recharge rate for all your USB powered devices
Built-in safeguards protect your devices against excessive current, overheating, and overcharging
Package Contents: AUKEY 20000mAh Power Bank, Micro USB Cable, User Manual, 24 Month Warranty

FIG. 4 is a block diagram of the energy flow from a AC or DC power source to the portable smart battery booster; and
[0019]

FIG. 5 is a block diagram of the energy flow from the portable smart battery booster to the smart device.
DETAILED DESCRIPTION
[0020]

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Even if the PowerCore 20100 is a little too big for your taste, you could always drop down to something like the PowerCore 10000 which has about half of the battery power at half the size for $23.99. You also lose the additional USB for simultaneous charging though, which is a deal-breaker for us. Maybe you’re the opposite and want something even bigger — the massive Anker PowerCore 26800 has three USB outputs for $55.99.

Whatever you opt for, you can’t go wrong with something out of Anker’s PowerCore line. The PowerCore 20100 seems to be the sweet spot between portability and functionality, so it gets out pick for the overall best.

There are exceptions to this rule, of course, and the Omnicharge we outline below can offer up to 4.8A from each USB-A output. It does not have a USB-C output, so you’ll need to check which outputs the power bank you select has before you purchase any cables.
And, on that note, not all cables are created equal, and some USB-C cables use the slower USB 2.0 protocol. Look for a USB-C 3.1 cable for the fastest connection.
It may be useful to look for a power bank that can be refilled over USB-C, since this will allow you to use the same cable for both charging your Switch and charging your power bank.

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Power Bank 10000 mAh Portable Power Source QC3.0 Wired Wireless Fast Charging Charger Power
US $8-10.77 / Unit
1 Unit (Min. Order)
Color: Black,Gray,Pink,Silver,White
Socket Type: USB
Outport: 5.0 0.25V,2.1A ; 5.0 0.25V,1A
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Weight: 285g
Model Number: XN-W01
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A 2.1A USB port is enough to charge any iPhone, iPad, or iPod even during heavy use, but as I mentioned during a recent episode of 9to5Mac’s Happy Hour podcast, Power Bank-category chargers are not optimized for charging something as power thirsty as even the low-power 12-inch MacBook during use. Power Bank’s ability to charge the MacBook will depend on how much energy the notebook is consuming.

Under very heavy use, Power Bank will juice your MacBook but expect to see battery continue to drop, just slower than usual
Under light to moderate use, Power Bank will maintain battery percentage or slowly raise battery percentage over several hours
Power Bank will charge an inactive/sleeping or powered off MacBook
Also important to note: Power Bank is not quick to charge itself. The portable battery ships with a short Micro USB cable for charging; you supply the power brick. When paired with a 2.1Amp power adapter, Power Bank required an estimated hour for each 10% increment of charge, spanning roughly 10 hours to complete a 100% charge after being fully depleted. The bottom line here is you’ll want to charge it the night before you venture away from home with a couple additional hours to spare.

FIG. 1 is a block diagram of a portable smart battery booster with an integrated internal battery pack where the output voltage is changed via hardware;
[0016]

If you are planning to visit the United States, or have friends and family here, shop at Kmart to get everything you want - including gifts for yourself or others. Shopping online in the USA at Kmart couldn't be easier. You can pay for your order in a store or even use an international credit card. Once you place an order, you (or someone you know) can pick it up at a Kmart store, have it shipped or delivered to a U.S. address, and even have it shipped to over 100 countries - whatever is most convenient for you. If you're looking to do some international online shopping, be sure to visit

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So, why don’t all suppliers have their electronics UL certified? Because it adds to the price. And what about all the portable chargers that have been sold over the last 5 years that were not UL tested? It all comes down to the supplier source. This is not a product you go on to Alibaba or some unknown supplier website to purchase, nor do you purchase from a distributor who does not understand how to protect your brand. At Custom Source, we have identified Secure Source Suppliers who only provide quality products which are compliant and safety tested. When it comes to chargers and power banks, that is a small list. It still amazes us that some of the largest promotional distributors carry products for which they have no documentation for safety testing (and often, customer service doesn’t even know the answer when you inquire). When looking at emergency chargers, you can’t determine quality by price. You need to know what you are purchasing, and the best way to do that is to work with a distributor who has extensive experienced in this area.

Now, let’s talk about other features you need to consider to choose the right charger for your promotion….

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Portable 2200mAh Mobile Power Bank/ 2200mAh Power Source / 2200mAh Lipstick
Shenzhen Oscoo Tech Co., Limited
China (Mainland) Trade Assurance
Transaction Level:
1 Transaction(6 months)
1,000+
Response Rate
58.1%
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New arrival walsun portable power banks, 220v ac outlet mobile power supply for smartphone/laptop
US $60.0 / Pieces
100 Pieces (Min. Order)
Color: Black,Gray,Multi,Silver
Socket Type: AC outlet
Outport: AC Output: 220V/100W ,USB Output: DC 5V/2.4A * 2 USB
Capacity: 15001-20000(mAh)
Brand Name: OEM ODM
Material: ABS
New arrival walsun portable power banks, 220v ac outlet mobile power supply for smartphone/laptop 5 Photos
Shenzhen Walsun Digital Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
5 Transactions(6 months)
700+
Response Rate
92.9%
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shenzhen portable power source for samsung a7 battery case mobile powerbank charger
US $3-6 / Piece
10 Pieces (Min. Order)
Color: Beige,Black,Blue,Brown,Golden,Gray,Green,Multi,Orange,Pink,Purple,Red,Silver,Transparent,White,Yellow,black white gold rose gold
Outport: 5V/1A;
Input: 5V/1A;
Weight: 116g
Model Number: NDR -GXA7
Place of Origin: Guangdong,China (Mainland)
shenzhen portable power source for samsung a7 battery case mobile powerbank charger 6 Photos
Shenzhen Haobang Electronics Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
5 Transactions(6 months)
6,000+
Response Rate
71.1%
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Power Bnak supply Lady gifts mobile charger best selling items power source 7000mah/unicorn power bank
The product arrives in a very appealing retail package. The front of the packaging has a clear window, fully displaying the battery pack. The surrounding green color starts as a light green at the top and changes to a dark green at the bottom. I really think that Griffin did a great job with the gradient coloring. You will notice a few major features of the device, military standard 6 foot/1.8 meter drop tested upon concrete, Protected against rain and dirt (IP66), 2.4 extra smartphone charges. Turning the package counterclockwise, the packaging details the charging capabilities: 2.4 charges for smartphones, ~18 charges for smart watches, ~85% charge for most tablets. It further details the 10W 5V/2.1A output, 5V/2A input, and the packaging contents: the battery, and the 12″ micro-USB to USB-A charging cable. It should be compatible with anything that charges via USB. Rotating the packaging another 90 degrees counterclockwise, you will notice the back details the LED charge indicator, the weatherproof shell, and the 6000 mAh capacity. The top of the case is orange colored and provides a very nice visual contrast to the green case.

This is a universal powerbank with a unique design. It can be used to charge mobile phones, tablets and other mobile devices. This well-made powerbank is a practical emergency power solution for your mobile devices when traveling. Charging time: 5.5 hours. Long service life. Dual USB ports for charging two devices at the same time. One micro USB port. 4-stage light indicator for showing power status.

Lift the magnetic front flap upwards and the battery is easily removed from the clear formed blister pack. You will immediately notice the rugged, heavy feel to the battery. The grip is rubberized and there is no obvious opening to the environment. Along the top right you will notice a bank of 4 LED and along the top, you will notice a rubber flap that is easily lifted upwards. Lifting up on the flap, you will find the circular power button, the USB-A output port, and the micro-USB input port. The flap is easily closed and does provide a good water resistant seal. The power button has a diagram on the outer part of the flap to allow you to check the LED power remaining. Out of the box, there were only 2 LED illuminated, suggesting 50% power available. There is no instruction manual in the case, but you will find a warranty card and a card asking for a review of Griffin products.

A further aspect of this disclosure is that the portable smart battery booster contains an internal battery pack that stores charge that is used to provide the energy to generate the output voltage and current.
[0014]
Type: USB Universal Portable Power Bank
Model Number: 5V Power Bank
Brand Name: OEM
Place of Origin: Guangdong,China (Mainland)
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Shenzhen VTD Technology Co., Ltd.
China (Mainland)
Transaction Level:
Response Rate
71.9%
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Gadget Novelty Gifts 6000mah portable source powerbanks
US $1-4 / Piece
10 Pieces (Min. Order)
Socket Type: Universal
Outport: 5V/2.1A
Dimension: 138*76*19mm
Type: Power Bank Mobile power supply
Model Number: Mobile 6000mah portable source
Capacity: 4001-5000(mAh),4000mAh 6000mah portable source
Gadget Novelty Gifts 6000mah portable source powerbanks 6 Photos
Fortune Port Technology Limited
China (Mainland) Trade Assurance
Transaction Level:
3 Transactions(6 months)
10,000+
Response Rate
74.8%
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USB Electric Power Source and smart electronic fan portable mobile power bank
US $4.3-4.5 / Pieces
60 Pieces (Min. Order)
Outport: 3.7V-5V/0.4A
Input: 3.7V-5V/0.4A
Dimension: 12.6cm*7.2cm*3.5cm
Battery type: 18650 Lithium Battery 2000mA
Model Number: WY-F2P
Place of Origin: Guangdong,China (Mainland)
USB Electric Power Source and smart electronic fan portable mobile power bank 4 Photos
Shenzhen Wuyangwandai Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
3 Transactions(6 months)
800+
Response Rate
75.0%
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high Capacity universal Portable mobile portable battery charger PowerBank source supply
US $3.99-6.99 / Piece
10 Pieces (Min. Order)
Socket Type: USB
Model Number: YZ-PB01
Capacity: 9000mAh
Brand Name: YZ
Place of Origin: Guangdong,China (Mainland)
Material: Frosting
high Capacity universal Portable mobile portable battery charger PowerBank source supply
Shenzhen Yuzhuo Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
90 Transactions(6 months)
30,000+
Response Rate
71.0%
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2014 Direct Factory 2600mah colourful rod portable source
300 Pieces (Min. Order)
Socket Type: USB,USB cable
Input: 5V1A
Dimension: 94*22*21mm
Capacity: 2600mah
Place of Origin: CN;GUA,Guangdong China (Mainland)
Material: Plastic
2014 Direct Factory 2600mah colourful rod portable source
Shenzhen Inno Vision Industrial Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
10 Transactions(6 months)
150,000+
Response Rate
93.5%
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Free sample,Hot Selling Compact Portable Mobile CE Rohs Lithium Polymer Backup Battery Power Bank 4000mah
US $1.5-35 / Piece
50 Pieces (Min. Order)
Color: Blue,Brown,Gray,Green,Orange,Pink,Purple,Red,White,Yellow
Outport: 5V/1A
Weight: 50
Dimension: 96*62*6.6mm
Brand Name: OEM
Place of Origin: Guangdong,China (Mainland)
Free sample,Hot Selling Compact Portable Mobile CE Rohs Lithium Polymer Backup Battery Power Bank 4000mah 6 Photos
Shenzhen MJ Electronical Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
19 Transactions(6 months)
10,000+
Response Rate
66.7%
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solar power bank charger, portable power source powerbank, ultra thin power bank 2600mah
US $0.99-6 / Piece
50 Pieces (Min. Order)
Outport: 5V 2100mAH
Input: 5V 1000mAH
Dimension: 130*78*15mm
Capacity: 5000mah,OEM
Brand Name: OEM
Place of Origin: Guangdong,China (Mainland)
solar power bank charger, portable power source powerbank, ultra thin power bank 2600mah
Shenzhen Pomes Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
2 Transactions(6 months)
200+
Response Rate
66.7%
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all certificate portable power source charge baby with hand warmer function powerbank high quality 4500mah powerbank
US $6.9-12.9 / Piece
100 Pieces (Min. Order)
Socket Type: USB Port
Outport: 5V 2A
Dimension: 100*75*20mm
Type: USB universal portable power bank
Capacity: 6000mah-18000mAh
Material: ABS+PC
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Dongguan Duohe Automatic Technology Co., Ltd.
China (Mainland)
Transaction Level:
7 Transactions(6 months)
130,000+
Response Rate
72.6%
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OEM custom logo mini LED light power bank power charging powerbank portable power source
US $4.29-6 / Piece
3000 Pieces (Min. Order)
Color: Beige,Black,Blue,Brown,Golden,Gray,Green,Multi,Orange,Pink,Purple,Red,Silver,Transparent,White,Yellow,Customer's Chioce
Socket Type: USB Port
Input: 5V/1A
Type: Mini Portable
Model Number: PS-12
Capacity: 5001-6000(mAh)
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Shenzhen CYX Electronics Co., Ltd.
China (Mainland) Trade Assurance
Response Rate
72.7%
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Best high quality deep sea power bank car mobile powerbank mini waterproof power supply rohs power bank 7800 mah portable source
US $35-55 / Piece
50 Pieces (Min. Order)
Color: Black
Outport: DC 5V 1.5A
Weight: 260g
Dimension: 115*28*29.2mm
Model Number: waterproof power bank
Brand Name: sunik
Best high quality deep sea power bank car mobile powerbank mini waterproof power supply rohs power bank 7800 mah portable source 6 Photos
Shenzhen Sunik Commerce Co., Ltd.
China (Mainland)
Transaction Level:
Response Rate
13.0%
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Slim 5000mAh External Battery Pack Ultra-Slim lightweight Charger Portable Powerbank
US $1.51-2.15 / Piece
10 Pieces (Min. Order)
Color: Black,Blue,Golden,Pink,Silver,White
Outport: 5V/1A
Input: Micro USB 5V/2A
Dimension: 153*76*9.8mm
Type: Portable power bank
Capacity: 3000-4000(mAh)
Slim 5000mAh External Battery Pack Ultra-Slim lightweight Charger Portable Powerbank 6 Photos
Shenzhen Sam Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
193 Transactions(6 months)
80,000+
Response Rate
90.4%
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2016 new wireless mobile charger mini power source with cheap price RSK5-1
US $5-10 / Piece
1 Piece (Min. Order)
Color: Black,Blue,Golden,Green,Red,White
Dimension: 117*65*9mm
Model Number: RSK5-1
Capacity: 4000mah
Brand Name: Faststar; Yoyo; OEM
Place of Origin: Guangdong,China (Mainland)
2016 new wireless mobile charger mini power source with cheap price RSK5-1 6 Photos
Shenzhen Yoyo Industrial Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
5 Transactions(6 months)
A microprocessor, microcontroller, programmable logic device, or other digital circuit or analog circuit 180 has input circuitry which receives communication from the smart device. The input circuitry may include a synchronous or asynchronous input, which may continuously monitor or may sample the signal always or for a predetermined period of time. A single direction communication with a smart electrical or electronic device 200 may provide a digital or analog signal 190 to the portable smart battery booster 110. The signal may be a single wire signal, or a multiple wire signal may be used to encode a signal like a bus or differential pair, for example, a protocol using two wires could be USB. The signal may be current or voltage based, (e.g. a voltage level, differential voltage level, or change in voltage). This signal may also be bi-directional. The smart electrical or electronic device 200 may provide the digital or analog signal 190 to the portable smart battery booster 110. If the signal is a bi-directional signal, the signal may include software or hardware handshaking The bidirectional communication enables the smart device 200 to send a signal to the portable smart battery booster 110 indicating the desired voltage output 130 for charging the smart device.

Many recent battery packs come with a built-in USB cable that wraps around the case so that you don’t need to worry about leaving the USB cable at home. To cater to iOS users, some of them come with a built-in Lightning cable instead. These Lightning connector-compatible battery packs tend to cost more than their USB counterparts because of the MFi (Made For iPhone/iPod/iPad) licensing and certification program fees the manufacturers have to pay.

Higher capacity battery packs also usually come with more than one USB charging ports. Naturally, more ports cost more money, and the number of ports you should go for depends on how many devices you carry. The biggest advantage of additional ports is that you can charge more devices at the same time. The tip here is to find out the total output current of the battery pack when more than one ports are used. For example, a battery pack with two 2A/5V ports may output the 2A when only one port is used. When both ports are connected, the total output may be limited to 3A, with each port getting 1.5A. There are of course others that have a total output of 4A (so both devices are able to charge as fast as they can), but as you might expect, they usually come at a premium.

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promotional gift portable powerbank 2200mAh
US $1.2-2.1 / Piece
1000 Pieces (Min. Order)
Outport: 5V 1A
Input: 5V/1A
Dimension: 90*20*20mm
Model Number: A1-6
Capacity: 3000-4000(mAh)
Place of Origin: Guangdong,China (Mainland)
promotional gift portable powerbank 2200mAh 3 Photos
Shenzhen Zhaoxinxin Battery Source Company Limited
China (Mainland)
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Customized logo printed powerbank portable power source charger mobile
US $1-3 / Piece
100 Pieces (Min. Order)
Color: White
Socket Type: Micro USB
Input: 5V 1A(DC)
Weight: 66g
Battery type: Li-ion Polymer Battery
Brand Name: OEM Power Bank
Customized logo printed powerbank portable power source charger mobile 5 Photos
Shenzhen Zhuoweite Electronic Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
4 Transactions(6 months)
10,000+
Response Rate
65.5%
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2014 hot selling gift powerbank 2600mah mobile phone lipstick portable charger for iphone5/5s,samsung,nokia,htc.
US $0.99-2.55 / Piece
500 Pieces (Min. Order)
Socket Type: USB standard
Weight: 74g
Model Number: YTK-048 Lipstick Power Bank
Brand Name: HYT
Place of Origin: Guangdong,China (Mainland)
Material: ABS shell
2014 hot selling gift powerbank 2600mah mobile phone lipstick portable charger for iphone5/5s,samsung,nokia,htc.
Shenzhen He You Tai Technology Co., Ltd.
China (Mainland)
Response Rate
57.7%
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2018 rechargeable power bank portable source 4000mah credit card powerbank slim mobile charger power bank with built in cable
US $4.81-5.5 / Piece
50 Pieces (Min. Order)
Color: Beige,Black,Blue,Brown,Golden,Gray,Green,Multi,Orange,Pink,Purple,Red,Silver,Transparent,White,Yellow
Socket Type: USB Port
Outport: 5V 1A/2.1A
Input: DC 5V/2A
Brand Name: OEM ODM
Material: ABS+Aluminum
2018 rechargeable power bank portable source 4000mah credit card powerbank slim mobile charger power bank with built in cable 5 Photos
Shenzhen Navata Technology Co., Ltd.
China (Mainland)
Transaction Level:
8 Transactions(6 months)
3,000+
Response Rate
95.9%
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Factory large capacity 13200mAh portable power source mobile external power bank 18650 battery charger for smartphone
US $9-15 / Unit
1000 Units (Min. Order)
Outport: USB 5V/1A, 2.1A
Dimension: 162*65*21mm
Model Number: MY60D
Capacity: 10001-15000(mAh),13200mAh
Brand Name: OEM Power Bank
Place of Origin: Guangdong,China (Mainland)
Factory large capacity 13200mAh portable power source mobile external power bank 18650 battery charger for smartphone 6 Photos
Shenzhen Apokin Science & Technology Company Limited
China (Mainland) Trade Assurance
Transaction Level:
3 Transactions(6 months)
10,000+
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Built-in LED flashlight 20000mah high capacity universal multi USB output digital products portable power source
US $11.4-12 / Piece
100 Pieces (Min. Order)
Outport: DC5V/1A, 5V/2.1A,
Input: DC5V/2A
Weight: 440g
Model Number: YN-025
Capacity: 15001-20000(mAh)
Place of Origin: Guangdong,China (Mainland)
Built-in LED flashlight 20000mah high capacity universal multi USB output digital products portable power source 6 Photos
Shenzhen MerPower Electronic Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
3 Transactions(6 months)
1,000+
Response Rate
43.5%
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powerbank 2017 latest products waterproof 2600mah power bank china source brands unique business ideas
US $2.6-2.7 / Pieces
500 Pieces (Min. Order)
Color: Black,Blue,Gray,Green,Orange,Pink,Red,White,Yellow
Input: Micro USB 5V/1A
Type: USB Universal Portable Power Bank
Model Number: M11
Capacity: 3000-4000(mAh)
Place of Origin: Guangdong,China (Mainland)
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Shenzhen Lessmore Innovation Technology Limited
China (Mainland)
Although many chargers carry CE, FCC,or Rohs certifications, these are compliance certifications which do not have ensure safety testing, and are often self verified. Only UL (United Labs) testing ensures that electronic components have been tested and passed the stringent safety requirements to ensure product safety. Most of the reputable suppliers are now changing their charger and power banks to those that are UL listed (the battery is certified) or UL certified (the battery and all the components of the charging devices is safety tested). Although the best certification for complete brand protections is UL certification, UL listed devices offer good security for brand protection.

Ideal for holidays, festivals, camping trips and busy work schedules, this Power Bank features an impressive 8000mAh capacity with two USB output connections, more than enough to charge a device two times over. With universal compatibility, portable design and LED power indicators, this clever device will charge all your devices quickly and easily using the rapid charge system.

The ideal travel buddy for all your essential gadgets, this 8000mAh dual USB Power Bank provides valuable back-up power for any one on the move, making it an essential purchase for any 21st century tech loving traveller!

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high quality capacity mobile portable power sources
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Portable 2,600mAh True Capacity Powerbank with Samsung Or...
China Portable 2,600mAh True Capacity Powerbank with Samsung Original Battery
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US$ 3.8 - 4.8 / Piece
500 Pieces (Min. Order)
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powerbank portable charger with Metal case and polymer ba...
China powerbank portable charger with Metal case and polymer battery for promotional gift
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US$ 2 - 25 / Piece
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2017 new portable outdoor camping solar zoom saline lamp ...
China 2017 new portable outdoor camping solar zoom saline lamp with powerbank
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US$ 17.42 - 24.24 / Piece
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Portable Powerbanks Auto Sensing Inductive Lighting Purse...
China Portable Powerbanks Auto Sensing Inductive Lighting Purse Light Handbag Light Power Bank 2000mAh
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Portable Powerbank Wireless Security Camera with wifi Con...
China Portable Powerbank Wireless Security Camera with wifi Connection,Video and Audio Recording
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US$ 30 - 40 / Piece
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China Li-polymer High energy smartphone powerbank 1000mAh with LED display
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Maxfield Wireless Charging 10,000 mAh Powerbank - Black
China Maxfield Wireless Charging 10,000 mAh Powerbank - Black
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US$ 1.95 - 10 / Piece
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Wireless Charging 4,000mAh Powerbank
China Wireless Charging 4,000mAh Powerbank
8
US$ 16 - 16.8 / Piece
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China Mini bluetooth headset with powerbank,ultra music time:2h*6times,ultra light,invisible earphone
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US$ 11 - 13 / Unit
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china ems pcba powerbank oem pcb manufacturing factory
US $0.5-13 / Piece
1 Piece (Min. Order)
Place of Origin: Guangdong,China (Mainland)
Model Number: PCB Assembly
Base Material: FR-4
Surface Finishing: HASL/HASL lead free
Min. Line Width: 0.075mm(3mil)
Board Thickness: 1.6mm
china ems pcba powerbank oem pcb manufacturing factory 6 Photos
Shenzhen Baiqiancheng Electronic Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
1 Transaction(6 months)
200+
Response Rate
81.8%
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Powerbank PCB Manufacturing and Assembly with China Price
US $0.5-2 / Piece
1 Piece (Min. Order)
Place of Origin: Guangdong,China (Mainland)
Brand Name: RayMing
Base Material: FR-4 Epoxy Resin
Min. Hole Size: Component Hole:0.6-2.0mm
Board Thickness: 0.2mm-4.5mm
Product name: Powerbank PCB Manufacturing and Assembly with China Price
Powerbank PCB Manufacturing and Assembly with China Price
Shenzhen Rayming Electronic Co., Ltd.
China (Mainland)
Response Rate
61.9%
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Multilayer PCB powerbank manufacture shenzhen pcb assembly
US $0.85-2.68 / Piece
1000 Pieces (Min. Order)
Copper Thickness: 1oz
Number of Layers: 2 layer
Place of Origin: Guangdong,China (Mainland)
Base Material: FR4
Brand Name: Dele-Power
Model Number: DDF-510
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Shenzhen Dele Power Electronic Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
11 Transactions(6 months)
I have a power-bank where I can put my own cells in. I put in 6 good cells, so it is now about 20Ah (at 3.7V). The converter for 5V is reasonably efficient and capable of 2A, so this one will power a pi just fine. But in this case the Ah rating is "20", and the current rating (AMP above) is only 2. The 'pi requires a current rating of about 0.7A. But because phones will charge anyway, people get away with claiming more than is technically possible. So you can buy 2A chargers that just tell the phone "I'm 2A", but then fail to deliver. The phone silently goes along.

mAh ratings are even worse when it comes to exagerating the numbers: most people are unable to verify the numbers. I have 18650 cells that claim 5500 mAh, but are 600mAh in reality. Allow me to power my 'pi from that battery for a few minutes when I get to work. It'll work. (I'll connect the 4.2V from the battery to the 5V of the pi, and it will work like that. This saves a conversion step between the 3.3V-4.2V of the battery to the "official" 5V that the pi needs, and then back again to 3.3V, 2.5V, 1.8V that the pi actually needs internally....) (USB devices might not work: many need something closer to 5V to work. ).

f you still love to use your phone, tablet, MP3 player, camera and games consoles on the move, but don’t always have a power source to hand, a power bank is great idea to keep all your favourite devices charged up when you’re out and about!

BatteryBox is a portable battery pack that can fit in the palm of your hand yet can still power your MacBook. BatteryBox can provide up to 12 hours of power for MacBook Air and 6 hours for MacBook Pro, which is also equivalent to 8 iPhones. It runs on its own BatteryOS to ensure that the rechargeable lithium-ion batteries is properly controlled. Besides MacBooks, BatteryBox can also charge any device via its USB port.

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Customized super-thin powerbank pcb keep long time power
US $0.1-10 / Piece
1 Piece (Min. Order)
Place of Origin: Guangdong,China (Mainland)
Brand Name: KLS
Model Number: PCB Assembly
Min. Hole Size: 0.20mm
Product name: Customized super-thin powerbank pcb keep long time power
Type: Electronic Board
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Kinglisheng(Shenzhen) Electronics & Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
29 Transactions(6 months)
30,000+
Response Rate
87.2%
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94V0 circuit board manufacturer multilayer pcb factory oem power bank circuit board, powerbank circuit board OEM factory
US $1-10 / Piece
1 Piece (Min. Order)
Place of Origin: Liaoning,China (Mainland)
Brand Name: BLD
Model Number: PCB assembly manufacturer
Min. Line Width: 0.1mm(4mil)
Min. Line Spacing: 0.1mm(4mil)
Copper Thickness: 1/2OZ 1OZ 2OZ 3OZ
94V0 circuit board manufacturer multilayer pcb factory oem power bank circuit board, powerbank circuit board OEM factory 2 Photos
BLD Electronic Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
6 Transactions(6 months)
70,000+
Response Rate
90.9%
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Electronic OEM PCBA service/prototype pcb assembly
US $1-2 / Piece
1 Piece (Min. Order)
Min. Hole Size: 0.1mm
Copper Thickness: 1oz
Number of Layers: 12-Layer
Surface Finishing: Lead free HASL
Place of Origin: Guangdong,China (Mainland)
Board Thickness: 1.6mm
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Shenzhen Huaxing PCBA Limited
China (Mainland) Trade Assurance
Transaction Level:
15 Transactions(6 months)
90,000+
Response Rate
88.5%
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Custom wifi circuit board high quality pcb pcba manufacture other pcb pcba
US $0.5-9.9 / Piece
1 Piece (Min. Order)
Place of Origin: Guangdong,China (Mainland)
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However, the Nintendo Switch is not going to draw 15V/2.6A at all times. Most likely, this is reserved only for when it is combined with the Dock and connected to a television.
We presume that in such a situation you will be using the Nintendo Switch at home and can connect its charger to mains power rather than a power bank. So when not connected to the Dock the Switch will draw much less power, and refilling its battery with a power bank won’t be a problem.
If you don’t believe us look at the Nintendo Switch car chargers: some are specified at 5V/1.5A, which almost any power bank can handle these days, and others at a fast-charging 5V/3A. Some of the better power banks can handle this, too. Also see: Best power banks 2017 UK

So what do you look for in a Nintendo Switch power bank?
What capacity do I need?
First, capacity. Most power banks operate at a minimum of around 65 percent efficiency, which means to fully charge the Switch’s 4,310mAh battery you would need to have a power bank at least 6,630mAh in capacity.
The bigger the better, though, and if you aren’t worried about carrying it in a trouser pocket and pulling down your pants then you could get a higher-capacity bank that offers several recharges for many more hours of unplugged fun.
Specifications:

Connectivity: 2 x USB, 1 x Micro USB
Input: 5V/1.0A
Output: 5V 1.0A, 5V 2.1A (dual USB)
Battery capacity: 8000mAh full capacity Li-polymer battery
Model: MA-2442-A
Measures approx. 15cm x 7cm x 1cm
Contents:

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According to one aspect of this disclosure, the charger communicates with the smart electrical or electronic device in response to communication from the electrical or electronic device. The portable smart battery booster adjusts the charging output voltage to meet the voltage requirements of the smart electrical or electronic device. The portable smart battery booster may communicate with multiple smart devices to allow charging a variety of smart devices from a single portable smart battery booster. This disclosure solves the problem of providing multiple output voltages from a single portable smart battery booster having an internal battery pack.
[0011]

The lithium-ion battery shown here is stuck down to the bottom of the case with sticky foam.

Removing the battery was difficult and, despite writing an entire article on lithium-ion battery safety, I use a sharp-ended screwdriver to pry the battery out. There was a spark, a bang, and a puff of smoke which had me throwing the battery out of the workshop in case it decided to catch on fire (remember, this is a 10000mAh battery so it packs a wallop). Luckily, the battery was fine and my dramatic reaction was seen by no one else, which helped to preserve my dignity for another day.

The lithium-ion battery has the designation LL 126090P 3.7V and a quick search on Google suggests that this battery is instead an 8000mAh battery instead of the stated 10000mAh capacity.

Another aspect of this disclosure is that the portable smart battery booster output voltage may be controlled by either hardware or software.
[0012]

The inside of the charger reveals a PCB with circuitry, a large lithium-ion battery, and a solar cell.

The battery is rated at 3.7A (with a 10000mAh capacity) and the solar cell has the designation RESUN-SOLAR 107-61 V5. A quick search on Google reveals that this solar cell is a 6V @ 1W (170mA) which would require a minimum of 49 hours of daylight (assuming that the light is enough to fully saturate the solar cell) to charge the battery from dead.

To that end, this solar cell is more of a “topper-offer” when not in use so that, when you do need to use the battery, the solar charge has provided some additional run time. (Trust me, you won’t complain about getting an extra two minutes on your phone when all other power sources are diminished.)

Another aspect of this disclosure is that the charging power may be provided by a portable battery pack, a DC adapter, or an AC adapter.
[0013]
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4000mah solar mobile power/solar charger mobile power

Update: After posting I tried running 4 processes at once. It ran for 22 minutes before the battery ran out. Note that although the battery claims 5300mAh, it is in fact only about 600mAh. And it was not fully charged. Also note that there was no battery protection circuit anywhere: the pi continued to try to run when the battery got below 3.0V. This is not good for such Lithium Ion batteries. (but you can get away with it if you charge it immediately with the correct procedure....)

Most people have some kind of emergency charger. So, how do you choose a product that will differentiate your premium from all the others. You call us 😊. Once we understand your audience and event venue, we recommend a product that will be the “one” they keep. Let’s face it, we all have our “favorite” pen or travel mug. If you want your charging device to create residual branding, it needs to be better than anyone the client or prospect owns. And we try all the new chargers so we can give you relevant advice! And the best product option, isn’t always the most expensive. For instance, I have a few favorites with different features that add convenience to my life. The charger banks that have suction cups are great when you need a charge on the run. Nothing more annoying than having to carry your phone and an emergency battery around when you are still trying to use the phone, like at a tradeshow! Having a boost charger is great if it fits on a keychain or hooks easily to something you carry around all the time…how many times do you need a real emergency “boost” but your charger is at home? And then I also keep a high capacity (compact size) power bank when I travel and know I will not be able to rejoice my phone or iPad until the end of the day.

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