Bq40370 - [exclusive]

This chip is frequently found in high-end Dell battery models, such as: Dell Latitude 7285 keyboard batteries. Dell PW23Y batteries. Compatible with standard communication protocols used in smart battery systems. NLBA1 Laptop Battery Analyzer and Repair Tool TI E2E support forums

If one cell group drops significantly lower than the others.

| Resource | Link / Document number | |----------|------------------------| | Datasheet | TI: SLUSC73 (bq40370) | | Technical Reference Manual | SLUUBF8 (bq40370 TRM) | | bqStudio software | TI.com (free) | | EV2400 interface | TI store | | CEDV calculation spreadsheet | TI application note SLUA777 | bq40370

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

For engineers looking to work with the BQ40370, there are significant limitations. TI's main software tool for configuring and calibrating battery gauges is ; however, the BQ40370 does not have a public bqz configuration file available for it. This lack of official public support is a strong indicator that the device is a custom or semi-custom part , likely developed for a specific Original Equipment Manufacturer (OEM). TI support representatives have explicitly stated that "This is not a public device, we cannot share information." This confirms that the BQ40370 was not intended for the general market but rather for a specific, large-volume customer like Dell. This chip is frequently found in high-end Dell

Laptops utilizing BQ40370 managed battery packs frequently suffer from structural and calculation degradation patterns. The 60% to 6% Capacity Drop Error

I assume you want the proper (technical) features/specifications for the BQ40370 battery-monitoring IC. Here are the key features and specs (concise): NLBA1 Laptop Battery Analyzer and Repair Tool TI

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

Use a battery analyzer to determine if the chip is detected and check for faults (e.g., OperationStatus = 0x00004183, FAS, Charging Disabled ).

| Command (hex) | Name | Description | |---------------|---------------|---------------------------------| | 0x02 | Temperature | Pack temperature (0.1°K) | | 0x04 | Voltage | Pack voltage (mV) | | 0x06 | Current | Pack current (mA) | | 0x08 | RemainingCapacity | mAh | | 0x0C | RelativeStateOfCharge | 0–100% | | 0x10 | CycleCount | Number of discharge cycles | | 0x16 | CellVoltage1–4 | Per-cell voltages (mV) | | 0x44 | ManufacturerAccess | Access to data flash, control functions |