Huawei Ascend HB5N1 Replacement Battery 3.7V 1500mAh

Huawei Ascend Series — 3.7V Li-ion Replacement Battery (HB5N1 / HB5N1H)

This is a 3.7V, 1500mAh Li-ion replacement cell for the Huawei Ascend smartphone range. It fits the Ascend G300, G302D, C8812, and dozens of related models that share the same battery bay and connector. Swap it in when the original cell no longer holds a usable charge or fails to power the phone through a normal day.

• Ascend G300 / G302D / C8812 platform compatibility: These models share an identical battery compartment, contact strip layout, and BMS handshake protocol — the HB5N1 and HB5N1H part numbers are interchangeable across the entire family without any firmware or connector conflict.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a G300 unit. The BMS accepted the new cell without a protection trip, charge current stepped correctly from bulk to taper, and the phone reached a clean 4.2V termination voltage.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle before resuming high-current charging. This lets the fuel gauge IC map the new cell's discharge curve before fast charge pushes unmetered current into an uncalibrated cell.

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

This is a voltage cliff, not a capacity problem. The Ascend's modem and display pull significant current during active use, and a fresh cell with an uncalibrated fuel gauge IC can show 25% remaining while the actual cell voltage drops below the BMS cutoff threshold under that load. The phone shuts off to protect the cell even though the percentage gauge hasn't reached zero. Run one full discharge — let the phone shut itself off naturally — then charge uninterrupted to 100%. After that cycle, the coulomb counter re-anchors to the real cell curve and the premature shutdowns stop.

OS reporting incorrect or jumping battery percentage after replacement

The fuel gauge IC on the Ascend is calibrated to the discharge curve of the original cell. When a new cell goes in, the IC is reading voltage-to-capacity ratios that no longer match the new cell's chemistry, so the percentage can jump erratically or read high while the phone is close to shutdown. This is not a faulty battery — it is a calibration mismatch. Fully discharge the phone until it powers off on its own, then charge it to 100% without interruption. One complete cycle resets the IC's reference points to the new cell and the percentage display stabilises.