Electron Power Managment on Four AA Batteries

[RWB]

Start looking at the PMIC functions, what your looking for will be in there if the function does exist which I think it does.

Changing Battery Charging Settings - Electron

You could have a look in the open source repo https://github.com/spark/firmware/blob/develop/wiring/inc/spark_wiring_power.h https://github.com/spark/firmware/blob/develop/wiring/src/spark_wiring_power.cpp In the header file are some comments about the registers and the .cpp does tell you about how they do it.