Bq40370 〈Original × GUIDE〉

is a custom Texas Instruments battery management chip frequently found in Dell laptop batteries

As a lithium-ion battery ages, its internal resistance increases. A standard gauge might show 40% remaining, but under a heavy load (e.g., a power drill or a laptop CPU spike), the voltage might sag below the cutoff threshold, causing a system shutdown. The bq40370 predicts this sag by tracking impedance, providing a Remaining Capacity (RM) reading that remains accurate even under pulsed loads. bq40370

: It uses an ACEDV (Adaptive Compensated End-of-Discharge Voltage) algorithm, which is a hybrid of the standard CEDV and Impedance Track (IT) methods. is a custom Texas Instruments battery management chip

The is a specialized battery management system (BMS) controller manufactured by Texas Instruments. It is primarily used as a gas gauge and protection solution for Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Poly) battery packs, particularly in laptop batteries for brands like Dell (e.g., the WDX0R and 3DDDG models). Technical Specifications and Capabilities : It uses an ACEDV (Adaptive Compensated End-of-Discharge