Adafruit LC709203F LiPoly / LiIon Fuel Gauge and Battery Monitor [STEMMA JST PH & QT / Qwiic] : ID 4712 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Gravity: I2C 3.7V Li Battery Fuel Gauge - DFRobot
Adafruit MAX17048 LiPoly / LiIon Fuel Gauge and Battery Monitor [STEMMA JST PH & QT / Qwiic] : ID 5580 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
In ZIYUN,Gravity: I2C 3.7V Li Battery Fuel Gauge,employs Gravity I2C interface,ultra-low operating current,real-time tracking of the relative state of charge (SOC),Low battery alarm,Reverse protection : Amazon.co.uk: DIY & Tools
DFR0563 Datasheet by DFRobot | Digi-Key Electronics
MAX17043 LiPo Fuel Gauge connects to Arduino via I2C #1 - YouTube