The Maivin Carrier board includes a 6.8mm battery holder so a rechargeable lithium battery can be installed to keep the real time clock (RTC) powered for uninterrupted timekeeping while primary power is disconnected.
- Panasonic ML-621S/ZTN - 5mAh 3V Battery
- Seiko MS621FE - 5.5mAh 3V Battery
Installing the Battery
Install the battery into BT1 holder.
The battery negative terminal should be placed towards the PCB.