# Adafruit LC709203F LiPoly / LiIon Fuel Gauge and Battery Monitor - STEMMA JST PH & QT / Qwiic

**Type:** Product page · **SKU:** ADA4712 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/adafruit-lc709203f-lipoly-liion-fuel-gauge-and-battery-monitor-stemma-jst-ph-qt-qwiic.html ([markdown](https://core-electronics.com.au/adafruit-lc709203f-lipoly-liion-fuel-gauge-and-battery-monitor-stemma-jst-ph-qt-qwiic.html.md))

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

## Pricing

- **Price:** $13.80 (inc GST) — $12.55 AUD, exc GST
- **Quantity discounts:** 10+ $12.17 (exc GST) · 50+ $11.92 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 6 more in 8–12 days.

## Description

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 LC709203F LiPoly / LiIon Fuel Gauge and Battery Monitor** does the same thing. Connect it to your [Lipoly or LiIon battery](https://core-electronics.com.au/power-batteries/liion-lipoly/2-pin.html) 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.

To use, [connect the single-cell battery](https://core-electronics.com.au/power-batteries/liion-lipoly.html) to one of the JST 2 PH ports (either one). Then use the [included JST PH jumper cable](https://core-electronics.com.au/jst-ph-2-pin-jumper-cable-100mm-long.html) to connect to your boost converter, Feather, whatever! Use the I2C interface and Adafruit's [Arduino](https://github.com/adafruit/Adafruit_LC709203F) or [CircuitPython/Python](https://github.com/adafruit/Adafruit_CircuitPython_LC709203F) library code to set the pack size (this helps tune the calculation) and read the voltage and percentage whenever you like. If you connect a 10K thermistor to the THERM pin you can also use it to read the battery pack temperature - Adafruit's packs do not come with a built in thermistor but many do.

To get you going fast, Adafruit spun up a custom made PCB in the[ **STEMMA QT** form factor](https://core-electronics.com.au/search/?q=stemma+qt+sensor), making it easy to interface with. The [STEMMA QT connectors](https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt) on either side are compatible with the [SparkFun Qwiic](https://core-electronics.com.au/catalogsearch/result/?q=qwiic) I2C connectors. This allows you to make solderless connections between your development board and the LC709203 or to chain it with a wide range of other sensors and accessories using a [**compatible cable**](https://core-electronics.com.au/search/?q=stemma+qt+cable).

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/4/7/4712-02.jpg)