SparkFun Battery Babysitter - LiPo Battery Manager

Description

The SparkFun Battery Babysitter is an all-in-one single-cell Lithium Polymer (LiPo) battery manager. It's half battery charger, half battery monitor, and you'll never need to keep your battery powered project running safely and extensively.

The Battery Babysitter features a pair of Texas Instruments LiPo-management ICs: a BQ24075 battery charger and a BQ27441-G1A fuel gauge. The charger supports adjustable charge rates of up to 1.5A, as well as USB-compliant 100mA and 500mA options. It also features power-path management, guaranteeing power to your project even if the battery has died. The self-calibrating, I2C-based BQ27441-G1A measures your battery's voltage to estimate its charge percentage and remaining capacity. It's also hooked up to a current-sensing resistor, which allows it to measure current and power! It's a handy IC to have, if you ever need to keep an extra eye on your project's power draw.

Features:

LiPo Charger and LiPo Fuel Gauge combined into one board
DIP-switch-selective charge rates of 100mA, 500mA or 1.5A
MicroUSB port for charging, or external options
Dynamic power-path management maintains a reliable output supply
On / Off switch disconnects the battery for more power saving
5V-tolerant I2C interface to fuel gauge
Fuel gauge measures voltage, percentage, and current

documents:

Schematic
Eagle Files
Hookup Guide
Data Sheet (BQ24075 Charger)
Datasheet (BQ27441-G1 Fuel Gauge)
Arduino Library
GitHub

Product information