Bq40370 🔥 🎯

The bq40370 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

Capacity Jumps: A common symptom of a failing BQ40370-based battery is a sudden drop in charge percentage (e.g., jumping from 30% to 5%). This usually indicates an "OverEstimated FCC" or a mismatch in the programmed CEDV coefficients for the specific cells used. bq40370

5. Conclusion

No solid technical documentation exists under the identifier bq40370 in public sources. The most probable explanation is a transcription error of a Texas Instruments bq40xxx battery management IC. Without additional context (e.g., device markings, PCB label, or originating system), a definitive match is impossible. The bq40370 is a specific battery fuel gauge

Example I²C read (SOC):

Start → 0x16 (write address + write bit) → command 0x0C → Stop
Start → 0x17 (read address + read bit) → read 2 bytes (SOC) → Stop