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Why would anyone even try to build a power bank - i.e. an external battery for charging mobile devices - these days?
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icstore DIY Power Bank/Powerbank Kit/Module Circuit Board Assembly,5V Micro USB Input for Charging 3.7V Lithium ion Rechargeable Battery/Cell 1A Mobile Phone Charger/Adapter, LED Indicator -Pack of 2 : : Computers & Accessories