This is an open source hardware 5V rechargeable power bank, intended for use with 1 Li-ion / Li-Pol 3.7V rechargeable battery cell.
oshw
power-bank
battery-charger
opensourcehardware
li-ion-battery
li-pol-battery
5v-recha
5v-rechargeable-power-bank
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Updated
Aug 13, 2020