https://templates.blakadder.com/m5stack_m5stamp_S3.html
M5Stack M5StampS3 Module (S007) Configuration for Tasmota
Configure your smart module to work with Tasmota open source firmware.
m5stack m5stamps3 moduleconfigurationtasmota
https://shop.m5stack.com/products/m5stamps3-bat-module-with-2-54-header-pin
M5StampS3 BAT Module with 2.54 Header Pin– m5stack-store
batmoduleheaderm5stackstore