Description Adafruit MAX17048 LiPoly / LiIon Fuel Gauge is a compact, low-power battery monitor designed for precise charge tracking in LiPo and LiIon-powered devices. Low cost Lithium Polymer batteries have revolutionized electronics – they’re thin, they’re light, they can be regulated down to 3.3V and they’re easy to charge. On your phone, there’s a little image of a battery cell that tells you the percentage of charge – so you know when you absolutely need to plug it in and when you can stay untethered. The Adafruit MAX17048 LiPoly / LiIon Fuel Gauge and Battery Monitor does the same thing. Connect it to your Lipoly or LiIon battery and it will let you know the voltage of the cell, it does the annoying math of decoding the non-linear voltage to get you a valid percentage as well! Since this nice chip is I2C, it works with any and all microcontroller or microcomputer boards, from the Arduino UNO up to the Raspberry Pi. And you don’t have to worry about logic level, as the gauge runs with 3.3V or 5.0V power and logic equally fine. How to Use To use, connect a 1S 3.7-4.2V Lithium Ion or Polymer battery to one of the JST 2 PH ports (either one). Then use a JST PH jumper cable to connect to your boost converter, Feather, whatever! Use the I2C interface and our Arduino or CircuitPython/Python library code to read the voltage and percentage whenever you like. There are various alerts, low power modes that can be customized as desired. Features Accurate Battery Monitoring: Measures battery voltage and calculates remaining charge percentage. I2C Interface: Easily integrates with any microcontroller (e.g., Arduino, Raspberry Pi) via I2C. Voltage Range: Designed for 1S Lithium Ion/Polymer batteries (3.7-4.2V). Low-Power Alerts: Customizable low-power modes and alerts for efficient battery management. STEMMA QT Compatibility: Easy solderless connection with compatible development boards using STEMMA QT connectors. Wide Compatibility: Works with both 3.3V and 5V logic levels. Multiple Connection Options: Includes two JST PH connectors for easy battery connection. Package Includes 1 x MAX17048 LIPOLY / LIION Fuel Gauge and Battery Monitor 1 x Male Header