Huawei Ascend P2 HB5Y1HV Replacement Battery 3.8V 2350mAh

Huawei Ascend P2 / Stream X / GL07S — 3.8V Li-Polymer Replacement Battery (HB5Y1HV)

This is a 3.8V, 2350mAh lithium-polymer replacement cell for the Huawei Ascend P2, Stream X, and GL07S smartphones. It replaces OEM part numbers HB5Y1HV and HB5Y1V. Capacity and dimensions match the original cell so the battery seats correctly in the chassis without modification.

• Ascend P2, Stream X, and GL07S compatibility: These three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all three draw from the same 3.8V nominal cell architecture, which is why one part number covers all of them.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Ascend P2. The BMS accepted the cell without triggering overvoltage or undervoltage cutoffs, and the charge IC negotiated correctly at the standard charge rate.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on a replacement cell

This is a voltage cliff issue. The fuel gauge IC was calibrated against the old, degraded cell's discharge curve. When the replacement cell hits a load spike — modem transmitting, screen at full brightness — the actual cell voltage drops below the shutdown threshold faster than the reported percentage suggests. The phone cuts out even though the gauge still shows charge remaining. One full discharge cycle to 0% and a complete charge to 100% resets the coulomb counter and realigns the gauge to the new cell. After that cycle, shutdowns at 20–30% should stop.

Phone won't power on after sitting in storage with the replacement battery installed

Lithium-polymer cells self-discharge during storage. If the cell drops below approximately 2.5V, the BMS enters a lockout state to prevent damage. The phone will not respond to the power button and may show nothing on screen. Connect the phone to a wired charger — not a wireless pad — and leave it for 15–20 minutes without pressing anything. The charge IC needs to trickle current into the cell before the BMS will release the lockout and allow normal power-on. If the screen shows no charging indicator after 20 minutes, try a different cable and a wall adapter rather than a PC USB port, which may not supply enough current to wake the BMS.