|work| | Bq40370
It utilizes a 32-pin QFN package (RSMR) , maximizing PCB space efficiency inside thin-and-light laptop enclosures.
| IC | Cell count | Gauge type | Flash/ROM | Balancing | |-------------|------------|------------|-----------|------------| | | 2–4S | CEDV | ROM | Passive | | bq4050 | 2–5S | CEDV | ROM | Passive | | bq40z50 | 2–4S | Impedance Track | Flash | Passive | | bq34z100 | 1S (with ext. divider) | Impedance Track | Flash | External |
: Unlike standard "IT" (Impedance Track) gauges, the bq40370 uses ACEDV , a hybrid method that provides high accuracy without requiring long "relaxation periods" (idle time) between cycles.
This happens when the IC enters a .
When the chip is locked, the host laptop may report "0% Available (Plugged In)" or refuse to recognize the battery. Conclusion
Once triggered, the chip sets a in its non-volatile memory (DataFlash). Even if you solder brand-new cells into the battery pack, the BQ40370 will refuse to charge or discharge, leaving the output voltage at 0V. Reprogramming, Unsealing, and Repairing BQ40370 Batteries
If you are looking to purchase a replacement, you can explore for related components or find tools for battery repair via Battery EEPROM Works . If you'd like, I can: bq40370
Note: In some cases, if the firmware is corrupted, the chip might not be recoverable, requiring a direct firmware re-flash. Common Challenges with BQ40370
High-side N-FET drive (eliminates the need for low-side, improving performance). LED Support
Newer versions of BE2Works regularly add support for updated BQ40370 firmware versions (e.g., FW V3.14), allowing technicians to clear locks on increasingly complex batteries. It utilizes a 32-pin QFN package (RSMR) ,
While the BQ40370 and BQ4050 share core technologies like 1-4 cell support and SMBus communication, the BQ4050 is the accessible, documented option for general engineering use .
Due to its widespread use in consumer electronics, the BQ40370 is a frequent subject in battery repair forums. When a battery pack stops charging or reports incorrect capacity, it is often due to the IC entering a "sealed" or "protected" mode due to a detected fault (e.g., cell imbalance, overvoltage). Challenges in Repair