https://www.redarcelectronics.com/eu/battery-chargers/smart-battery-monitoring
Smart Battery Monitor - REDARC Dual Battery Systems
Keep track of your battery levels in real time. The REDARC Smart Battery Monitor is here to help you focus on adventure. Buy online now.
smart battery monitordual systemsredarc
https://www.esphome.io/components/sensor/lc709203f/
LC709203F Battery Monitor - ESPHome - Smart Home Made Simple
Instructions for setting up LC709203F battery monitor.
lc709203f battery monitorsmart homemade simpleesphome