The is a highly specialized battery management and gas gauge integrated circuit (IC) manufactured by Texas Instruments (TI) . It is prominently found embedded within the battery management systems (BMS) of various modern laptop batteries, most notably across popular Dell notebook battery models like the WDX0R , YRDD6 , PW23Y , and F3YGT .
It monitors individual cell voltages, pack voltage, current, and temperature, providing precise SoC (State of Charge) data. bq40370
The chip is usually "sealed" to prevent unauthorized access. Unsealing requires specific keys, which professional repair software can sometimes bypass or provide. The is a highly specialized battery management and
: To fix inaccurate battery percentages, a manual calibration cycle is often needed: discharge the battery at a rate similar to the laptop's consumption (approx. 0.5A for many Dell packs) to ensure the chip accurately relearns the actual cell capacity. The chip is usually "sealed" to prevent unauthorized access
(Adaptive Compensated End-of-Discharge Voltage) gauging technology. Hybrid Approach:
The BQ40370 is often categorized as an , which is a hybrid gauging technology that combines Compensated End-of-Discharge Voltage (CEDV) algorithms with some features typically found in Impedance Track (IT) gauges.