HB474284RBC Huawei C8816 Replacement Battery 3.8V 2000mAh

Huawei Ascend Y550 / C8816 Series — 3.8V Li-ion Replacement Battery (HB474284RBC)

This is a 3.8V, 2000mAh Li-ion replacement battery carrying OEM part number HB474284RBC. It fits the Huawei C8816, C8816D, Ascend Y550, and Ascend Y550-L01, among other models in this series. Swap it when the original cell can no longer hold charge through a normal day of calls, messaging, and screen use.

• C8816 and Y550 series compatibility: These models share the same 3.8V single-cell architecture, connector pinout, and BMS handshake protocol — one cell fits across the range without hardware modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a C8816 unit. The BMS accepted the new cell without fault codes, and the charge IC stepped through CC/CV phases correctly to full termination.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the coulomb counter a clean reference cycle against the new cell's discharge curve before high-current charging begins.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity defect. When the modem transmits or the screen peaks in brightness, current draw spikes briefly. If the fuel gauge IC is still calibrated to the old cell's discharge curve, it misreads the state of charge, and the phone hits the hardware low-voltage cutoff before the percentage reaches zero. One full discharge-to-shutdown followed by an uninterrupted charge cycle resets the coulomb counter to the new cell's actual curve. After that cycle, shutdowns at 20–30% stop on most units.

Phone reports wrong battery percentage after cell swap

The fuel gauge IC stores a learned discharge curve from the old cell in non-volatile memory. A new cell with different internal resistance reads differently under load, so the percentage shown drifts — often reading full for longer than expected, then dropping fast near the bottom. The fix is a single full calibration cycle: drain the battery until the phone powers off on its own, then charge straight to 100% without interruption. After that cycle, the OS percentage tracks the actual cell state within a normal margin.