About this replacement
Huawei Ascend G660 Series — 3.8V Li-Polymer Replacement Battery (HB444199EBC)
This is a 3.8V, 2300mAh Li-Polymer replacement battery for the Huawei Ascend G660, G660-L75, and G660-L075 smartphones. It uses OEM part number HB444199EBC and matches the original cell's dimensions at 96.95 × 40.43 × 4.30 mm. If your G660 drains fast, shuts down unexpectedly, or no longer holds a useful charge, this cell replaces the degraded original.
- G660 series fit: The G660, G660-L75, and G660-L075 all share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell covers all three variants without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on G660 hardware. The BMS accepted the cell without fault flags, and the fuel gauge IC initialised correctly on the first full cycle.
- First-cycle fast charge tip: On first use after installation, disable fast charging and complete one full discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.
Why the G660 reports wrong battery percentage after a cell swap
The G660 uses a fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. When you install a new cell, the IC is still calibrated to the old, degraded curve. This causes the percentage readout to be inaccurate — often reading full when the cell is not, or dropping sharply without warning. One complete discharge-to-shutdown followed by a full charge at standard rate forces the IC to rewrite its reference curve against the new cell.
Sudden shutdown at 20–30% remaining on the replacement cell
This is a voltage cliff issue. Under heavy load — active LTE modem, screen at full brightness, or GPS — the cell's terminal voltage drops faster than the fuel gauge IC predicts, crossing the BMS cutoff threshold while the display still shows 20–30%. The BMS triggers shutdown to protect the cell from over-discharge. After the recalibration cycle described above, the fuel gauge tracks the voltage drop more accurately and the premature shutdowns stop. If they continue after two full cycles, check that you completed the first cycle at standard charge rate, not fast charge.