About this replacement
Huawei Ascend G750 — 3.8V Li-ion Replacement Battery (HB476387RBC)
This is a 3.8V, 3000mAh Li-ion replacement battery for the Huawei Ascend G750 smartphone. OEM part number HB476387RBC. It also fits the Ascend G750-T00, Glory 4, and B199 among other compatible models in the same hardware family.
- G750 family compatibility: The Ascend G750, G750-T00, Glory 4, and B199 share the same battery bay dimensions, connector pinout, and charge IC handshake — all confirmed against the HB476387RBC form factor at 86.40 × 62.50 × 4.50mm.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on G750 hardware. The BMS accepted the charge IC handshake without error flags, and the fuel gauge IC began tracking cell voltage across the full 3.8V nominal curve without tripping cutoff.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes amps into an uncalibrated coulomb counter.
Why the G750 reports wrong battery percentage after a cell swap
The G750's fuel gauge IC stores a discharge curve calibrated to the original cell. When a new cell goes in, the IC has no reference for the new cell's internal resistance or capacity profile. It keeps reading from the old curve, so the percentage shown on screen drifts from reality. One full discharge to automatic shutdown — followed by a complete charge to 100% without interruption — resets the coulomb counter and lets the IC build a new curve against the actual cell.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff issue, not a capacity issue. Under modem load or screen brightness peaks, the new cell's voltage drops briefly below the BMS protection threshold — typically around 3.0V per cell — before recovering. The BMS reads that dip as a low-voltage fault and cuts power instantly. The reported percentage at the time of shutdown is meaningless — it reflects the uncalibrated fuel gauge, not actual cell state. Run one full discharge cycle to let the IC recalibrate, then check that the phone is not running background sync or GPS during the next test discharge.