> 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:**

![](/files/-M2HXHlF68nopjCNBSX5)

**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)**

![](/files/-M2HXHlHh3YCXwtv_Oft)

![](/files/-M2HXHlJsupfWWyHMGq8)

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.

![](/files/-M2HXHlLtExVxTMm6pEl)

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.

![](/files/-M2HXHlNSZVXBf698rbA)