Disclaimer: This article is intended for general informational purposes only. The information provided on resetting or reprogramming electronic components is for reference. Such procedures carry inherent risks and should not be attempted unless you have the required technical expertise. The author and publisher are not responsible for any damage or injury that may result from any procedures described herein.
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 bq40370
If you have a battery pack with a bq40370 that is outputting 0V at the terminals, here is the repair hierarchy. The author and publisher are not responsible for
| Condition | CHG FET | DSG FET | Pack output | |-----------|---------|---------|--------------| | Normal operation | ON | ON | Enabled | | Overvoltage | OFF | ON | Disabled (can’t charge) | | Undervoltage | OFF | OFF (or ON if precharge) | Disabled | | Overcurrent (discharge) | OFF | OFF | Disabled | | Overtemperature | OFF | OFF | Disabled | | Condition | CHG FET | DSG FET
: In extreme safety events, the IC directs current to the heater element of a chemical three-terminal fuse (such as the D6SA3-12 ), physically melting the internal trace to permanently isolate the battery. Common Technical Failure Modes