These rechargeable lithium-ion batteries help ensure you’ve always got power when you need it. Whenever a smartphone or tablet is running low, just plug in the backup battery and you’re back in business, even if you aren’t near a power outlet. The capacity also varies, from 2,000mAh, which will give an iPhone one full charge, to 12,000mAH, which can charge a phone multiple times or larger tablets.
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