HB376883ECW Huawei P9 Plus Replacement Battery 3.82V 3400mAh

Huawei P9 Plus — 3.82V Li-Polymer Replacement Battery (HB376883ECW)

This is a 3400mAh Li-Polymer cell at 3.82V nominal, built to replace the original battery in the Huawei P9 Plus and P9 Plus Dual SIM variants. It covers OEM references HB376883ECW, HB376883EBW, HB376783ECW, and HB376883EBC. Physical dimensions are 81.10 × 67.30 × 3.60 mm — confirm your original cell matches before fitting.

• P9 Plus and Dual SIM coverage: The VIE-L29 platform — including standard, Dual SIM, and TD-LTE variants — shares the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell fits all variants listed above without any hardware modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on P9 Plus hardware. The BMS accepted the cell without fault flags, and the charge IC held a steady taper current to 4.40V at end of charge — consistent with Huawei's high-voltage Li-Polymer spec.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the P9 Plus after a cell swap

A fresh cell has a steeper voltage-versus-capacity curve than a worn cell. The fuel gauge IC — still calibrated to the old cell — misjudges how much charge is left. When the modem fires a high-power transmission burst or the screen peaks brightness, the cell voltage sags below the shutdown threshold before the OS registers low battery. Running one full discharge to 3% and a complete recharge without fast charging resets the coulomb counter to the new curve and eliminates the premature cutoff.

USB fast charge not triggering on the first cycle after replacement

Huawei's proprietary fast charge protocol — FCP — requires the charge IC to negotiate voltage and current with the charger after reading internal resistance from the new cell. On a brand-new cell, internal resistance is slightly elevated from factory storage, and the charge IC may default to standard 5V/1A input as a precaution. This typically resolves after the first full charge cycle as the cell conditions and internal resistance settles. If fast charge still does not activate after two cycles, check that cell voltage at rest is above 3.6V before connecting the charger.