Huawei C7600 Compatible Battery HB5B2 3.7V 880mAh

Huawei C7600 / C5900 / U7300 Series — 3.7V Li-ion Replacement Battery (HB5B2)

This is a 3.7V, 880mAh Li-ion cell replacement for Huawei handsets carrying the HB5B2 or HB5B2H OEM part number. It fits the C7600, C5900, U7300, U7310, and eight additional models on the same platform. The cell measures 44.00 × 38.00 × 5.20mm and delivers 3.26Wh total energy.

• C7600 / U7300 platform compatibility: These models share the same battery footprint, connector pinout, and BMS handshake protocol. Huawei used a unified power architecture across this generation, so one cell covers the entire range without modification.
• Bench tested on actual hardware: We ran this cell on a C7600 unit and monitored the BMS through charge and discharge. The protection circuit held cutoff at 4.20V on charge and 3.0V at low end — both within spec. No thermal events or communication errors during testing.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the system applies high-current charging to an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity fault. Under modem or screen load, the new cell draws a sharp current spike that drops the terminal voltage below what the fuel gauge IC expects at that state of charge. The phone's protection circuit reads that voltage dip as a dead cell and cuts power. Running one full discharge cycle down to ~3.0V and charging back to 4.20V gives the coulomb counter enough data to recalibrate its low-end threshold and stop triggering early shutdowns.

Device not powering on after storage — BMS lockout below 2.5V

If the phone won't respond after the battery sat discharged for weeks, the BMS has likely entered deep-discharge lockout — a protection state that activates when cell voltage drops below approximately 2.5V. Plugging in the charger will not immediately wake the device. Hold the charger connected for 10–15 minutes to allow the BMS to trickle enough current into the cell to exit lockout, then attempt a normal power-on. If the cell recovers past 3.0V, normal charging resumes automatically.