The bq219XL Smart Battery Module provides a complete solution for the design of intelligent battery packs. The bq219XL uses the SMBus protocol and supports the Smart Battery Data commands in the SMB/SBD specifications. Designed for battery pack integration, the bq219XL combines the bq2092 or bq2040 Gas Gauge IC with a serial EEPROM on a small printed circuit board. The board includes all the necessary components to accurately monitor battery capacity and communicate critical battery parameters to the host system or battery charger. The bq219XL also includes four LEDs. The push-button switch activates the LEDs to show remaining battery capacity in 25% increments.