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%