Powerbank DIY 12000-16000 mAh 2.1A
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I designed a power bank for four 18650 batteries. The assembly process is detailed in a YouTube video, part two of the series. This device features three interchangeable lids and a 2.1A USB PCB board that can charge an iPad without any issues. If you're interested in building one, the required parts are available on Banggood: the dual USB PCB board can be found at https://www.banggood.com/Dual-USB-PCB-Board-for-18650-Battery-Power-Bank-p-1245554.html; the battery holder is located at https://www.banggood.com/DIY-4-Slot-Battery-Holder-for-18650-Battery-Power-Bank-p-1291231.html; and the 4000mAh batteries are available in a pack of four at https://www.banggood.com/4PCS-4000mAh-18650-Rechargeable-Li-ion-Batteries-p-1245563.html. For 3000mAh options, check out http://www.gearbest.com/battery-sets/pp_000006419321320.html.
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