Below is a snapshot of a Pineng Power Bank
Power Bank Charging PCB board, PN983S-F
- Circuit include a boost converter to boost 3.7V to 5V
- Similar schematic can be obtained from easyeda
3.7V GPC 5565113-2P 1000 mAh Lithium-ion Polymer
- 3.7v is nominal voltage, which is average (4.2V to 3.2V)
- 4.2V is maximum voltage, which can be translated 100% charged
- 3.2V is minimum which can be translated to 0%
- 3.7 is just nice middle, of this value which is the average
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