> For the complete documentation index, see [llms.txt](https://bananapi.gitbook.io/bpi-m2-ultra-open-source-single-board-computer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bananapi.gitbook.io/bpi-m2-ultra-open-source-single-board-computer/chapter1/bpi-m2ultra37vlithiumbatteryinterface.md).

# BPI-M2 Ultra 3.7V lithium battery interface

![](/files/-M2HXPcajMT7Lb38YwwW) so you can use this interfact connect 3.7V lithium battery.

SCH:

![](/files/-M2HXPcc7iby0nyQ159S)

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

![](/files/-M2HXPcee8ODu0ggc7Gb)

Battery Charger

![](/files/-M2HXPcgdp6wkCy6NZ3J)

Lithium battery charger 100%

![](/files/-M2HXPciStips-me7jYz)