bq34210-Q1 Automotive CEDV Fuel Gauge Texas Instruments bq34210-Q1 Automotive 1-Series Cell System-Side CEDV Fuel Gauge provides fuel gauging and End-of-Service (EOS) Determination for 1-series cell batteries in applications that encounter infrequent discharge. These applications include eCall systems and uninterruptible power supplies (UPS) for backup during power failures, where batteries may stay connected to a charging power source for most of the device's lifetime until needed. Several battery chemistries are supported on the device, including Li-Ion, LiFePO4, and NiMH.