35H00127-02M Dopod Wildfire Replacement Battery 3.7V 1000mAh

Dopod Wildfire / G7 mini — 3.7V Li-ion Replacement Battery (35H00127-02M)

This is a 3.7V, 1000mAh Li-ion cell replacement for the Dopod Wildfire, G7 mini, A3333, and G8 smartphones. It matches the original cell footprint at 65.00 × 43.85 × 4.50mm and uses OEM part numbers 35H00127-02M, BA S440, BB00100, 35H00127-04M, 35H00127-05M, and 35H00127-06M.

• Wildfire / G7 mini / A3333 / G8 compatibility: These four models share the same HTC-platform battery bay, connector pinout, and BMS handshake protocol. Swapping between them uses the same cell without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Wildfire unit. The BMS accepted the cell without fault flags, charge termination triggered cleanly at 4.2V, and protection cutoff activated correctly at the low-voltage threshold.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to shutdown followed by an uninterrupted charge to 100% before normal use. The Wildfire's fuel gauge IC was calibrated to the original cell's discharge curve — one complete cycle re-anchors the coulomb counter to the new cell.

Why the Wildfire reports wrong battery percentage after a cell swap

The Wildfire uses a fuel gauge IC that tracks charge by measuring accumulated current — not raw voltage. When you replace the cell, the IC still holds the learned discharge profile from the old, degraded cell. Until it recalibrates, the percentage shown on screen drifts significantly from actual charge state. One full discharge-to-shutdown followed by a full uninterrupted charge resets the learned curve. After that cycle, the reported percentage tracks the new cell accurately.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the cell voltage drops sharply under load — typically during a call or with the screen at full brightness — faster than the fuel gauge anticipates. The cell hits the BMS low-voltage cutoff (around 3.0–3.2V) while the OS still shows charge remaining. It is a calibration lag, not a faulty cell. Run two full discharge-charge cycles without interruption, and the fuel gauge IC will map the new cell's voltage-sag curve correctly, eliminating premature shutdowns.