> For the complete documentation index, see [llms.txt](https://bananapi.gitbook.io/bpi-m3/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-m3/zh/bpim3lithiumbatteryinterface.md).

# BPI-M3  3.7 V lithium battery interface

**1,Battery interface of BPI series:**

![](https://3925975408-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRJQoosYe3-dUmx%2F-M2HWuG855qPFbpCRkE5%2F-M2HXHlF68nopjCNBSX5%2F3.7V.jpg?generation=1584080179396074\&alt=media)

**2,The red wire of battery connects to the anode on the board, the black wire to the cathode on the board(Note: DCIN pins in the GPIO need 5.0V DC Input)**

![](https://3925975408-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRJQoosYe3-dUmx%2F-M2HWuG855qPFbpCRkE5%2F-M2HXHlHh3YCXwtv_Oft%2F1.png?generation=1584080179246600\&alt=media)

![](https://3925975408-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRJQoosYe3-dUmx%2F-M2HWuG855qPFbpCRkE5%2F-M2HXHlJsupfWWyHMGq8%2FIMG_1683.JPG?generation=1584080179251073\&alt=media)

3,when plugging with lithium battery,the power LED is not on until you press the power-on button for several seconds, and then it boots up.

![](https://3925975408-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRJQoosYe3-dUmx%2F-M2HWuG855qPFbpCRkE5%2F-M2HXHlLtExVxTMm6pEl%2FIMG_1686.JPG?generation=1584080179314205\&alt=media)

USB,OTG,DSI,CSI work fine when the board is powered by lithium battery.

4, The battery will be charged when DC power is connected.

![](https://3925975408-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRJQoosYe3-dUmx%2F-M2HWuG855qPFbpCRkE5%2F-M2HXHlNSZVXBf698rbA%2FIMG_1684.JPG?generation=1584080179214296\&alt=media)