Bq40370 Jun 2026

The BQ40370 offers a range of key features and benefits that make it an attractive solution for battery management applications. Some of the most notable features include:

The is a specific battery fuel gauge chip, primarily found in Dell laptop batteries (such as the WDX0R and PW23Y models). Because it is a "custom" Texas Instruments chip, there is no public official datasheet, which has led to a community-driven body of "articles" and forum guides focused on unlocking and repairing it. Key Community Articles and Resources bq40370

The bq40370 has a safety feature called Permanent Failure . If the chip detects a voltage imbalance greater than 400mV across cells, a shorted FET, or over-temperature, it blows an internal electronic fuse (or drives the CHG/DSG FETs off permanently). You cannot clear a PF flag without proprietary TI software (often requiring an unlock code from the OEM). Result: Recycled battery. The BQ40370 offers a range of key features