BCC1023 MetroPCS HWM931 Replacement Battery 3.7V 1800mAh

MetroPCS HWM931 / Premia 4G — 3.7V Li-ion Replacement Battery (BCC1023)

This is a 3.7V, 1800mAh Li-ion replacement battery for the MetroPCS HWM931, HWM931-R, and Premia 4G smartphones. It carries OEM part number BCC1023 and matches the original cell's voltage and physical footprint. If your Premia 4G no longer holds a charge through the day, this cell swaps directly into the battery bay.

• HWM931, HWM931-R, and Premia 4G compatibility: All three model designations share the same Huawei-based hardware platform, the same 3.7V battery bay, and the same BCC1023 connector pinout — so one cell covers all three variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the HWM931 platform and confirmed the BMS handshake completes without fault codes. Charge current ramps normally and the protection circuit trips correctly at the low-voltage threshold.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — preventing erratic percentage readings from the first charge onward.

Sudden shutdown at 20–30% on the Premia 4G after a cell swap

This happens because the fuel gauge IC inside the phone was calibrated to the old cell's discharge curve. When the modem or screen pulls a high current burst, the new cell's voltage drops faster than the IC expects at that state of charge. The phone interprets the voltage sag as an empty cell and shuts down — even though capacity remains. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and realigns the gauge to the new cell's actual curve.

USB charging not recognised on the first cycle after replacement

A new BCC1023 cell arriving at a low state of charge can sit below the threshold the charge IC needs to initiate a normal charging session. The phone may show no charging indicator or cycle the screen on and off. Connect the device to a wall adapter — not a PC USB port — and leave it undisturbed for 15–20 minutes. The charge IC will trickle current into the cell until it crosses approximately 3.0V, at which point the normal charge cycle starts and the indicator appears.