ESP8266 Monitor its Own Battery Level using Blynk IoT for Battery Powered Projects - YouTube
SOC Monitor PowerTech
BQ76940: 20-23S Li-ion battery pack monitor, using 2 stacked IC with different I2C address - Power management forum - Power management - TI E2E support forums
3-to-8 Cell Li-ion Battery Monitor IC - EEWeb
Simple battery monitoring! IC with a “supply voltage divided output”! – ABLIC Inc.