It communicates with the laptop motherboard's Embedded Controller (EC) via the SMBus / I2C protocol , transmitting telemetry like temperature, voltage, and remaining capacity.
The is a specialized power management integrated circuit (IC) commonly used in high-performance lithium-ion (Li-ion) and lithium-polymer (Li-Poly) battery packs, particularly within the notebook computer market. As a sophisticated battery management unit (BMU), the BQ40370 is responsible for crucial tasks including fuel gauging, cell balancing, and safety protection. It is often found in Dell laptop battery packs, such as the WDX0R , where it enables precise battery monitoring and longevity. Chip Type: Power Management IC / Fuel Gauge. Common Packages: VQFN-32 (BQ40370RSMR) Go to product viewer dialog for this item. , as listed on eBay . Key Functions: Fuel Gauging, Protection, Cell Balancing.
The is a specialized battery gas gauge integrated circuit (IC) primarily found in Dell laptop batteries . It serves as the "brain" of the battery pack, managing charging, monitoring health, and communicating with the laptop's motherboard. Technical Overview
The is a specialized battery management chip developed by Texas Instruments (TI) , primarily found in Dell laptop batteries (such as the WDX0R, 3DDDG, and F3YGT models). Unlike standard retail chips, it is a custom product, meaning full public datasheets and documentation are generally unavailable from TI. Key Technical Specs & Features bq40370
It utilizes a 32-pin QFN package (RSMR) , maximizing PCB space efficiency inside thin-and-light laptop enclosures.
The BQ40370 supports LED display functionality (when implemented in the design). Upon detecting a high-to-low transition on the DISP pin, it can display the state-of-charge via 4-5 LEDs, according to the BQ40Z50-R4 Technical Reference Manual. BQ40370 Battery Repair and Unlocking
To resolve the identity of bq40370 , consider the following actions: It is often found in Dell laptop battery
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The BQ40370 often enters a "locked" state or triggers a Permanent Failure Flag (PFF) if it detects a cell imbalance or if the battery cells are disconnected during a repair.
: If the chip detects a critical failure (like over-discharged cells), it sets a PFF to permanently disable the battery for safety. Reprogramming and Repair , as listed on eBay
Refer to TI datasheet (SLUSC73) for full pinout.
Dell WDX0R BQ40370 – Laptop Battery Chip Reset, Reprogram and Repair – Laptop Battery Analyzer and Repair Forum. Forums. NLBA1 Laptop Battery Analyzer and Repair Tool BQ40370 Gauge Enable feature - NIP Embedded Systems
Manages the voltage levels of 2-series to 4-series cell packs to ensure all cells discharge and charge equally, enhancing battery lifespan. Advanced Protection Features: Overcurrent in Discharge (OCD) Short-Circuit Protection Overvoltage (OV) / Undervoltage (UV) Temperature Monitoring: Supports external NTC thermistors.