BPI-M2 Ultra 3.7V lithium battery interface
so you can use this interfact connect 3.7V lithium battery.
SCH:

battery interface spec:
https://drive.google.com/file/d/0B4PAo2nW2KfnSmVuVDhQc0NLdG8/view?usp=sharing
BPI-M2 Ultra test 3.7V lithium battery interface with Ubuntu linux
Lithium battery discharge

Battery Charger

Lithium battery charger 100%

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