MetroPCS HWM931 Replacement Battery BCC1023 3.7V 1500mAh

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

This is a 3.7V, 1500mAh Li-ion replacement battery for the MetroPCS HWM931, HWM931-R, and Premia 4G smartphones. It uses OEM part number BCC1023 and fits directly into the original battery compartment. Swap this in when the original cell no longer holds a usable charge across a normal day.

• HWM931 and Premia 4G platform fit: Both the HWM931 and Premia 4G run the same 3.7V single-cell architecture with an identical BCC1023 footprint. The connector orientation and BMS communication lines match across both variants, so no adapter or modification is needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on HWM931 hardware. The BMS accepted charge handshake without error, held voltage above 3.5V through mid-discharge, and tripped protection cleanly at the low-voltage threshold — no runaway, no false cutoff.
• Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one full discharge down to automatic shutoff, then charge to 100% uninterrupted. The phone's fuel gauge IC is still calibrated to the old cell's discharge curve — that single full cycle gives it the data it needs to report accurate percentages on the new cell.

Sudden shutdown at 20–30% on the HWM931 after a cell swap

This is a voltage cliff problem, not a capacity problem. Under peak load — modem transmit, screen at full brightness, background sync — the new cell briefly drops below the BMS cutoff threshold even though the fuel gauge still reads 20–30%. The phone shuts down to protect the cell, not because it is empty. The fix is one full discharge-charge cycle so the coulomb counter maps the new cell's actual voltage-to-capacity curve. After calibration, the shutoff point aligns correctly and the premature cutoff stops.

Phone shows wrong battery percentage after replacement

The fuel gauge IC on the HWM931 stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches the actual voltage profile of the replacement. The percentage readout pulls from the old model, so the number on screen drifts — often reading 50% when the cell is closer to 30%, or jumping several points between screen refreshes. Run one complete discharge to automatic shutoff and one uninterrupted charge to 100%. That resets the coulomb counter reference and brings the percentage display back in line with real cell state.