Huawei Ascend P6 Replacement Battery HB3742A0EBC 3.8V 2000mAh

Huawei Ascend P6 — 3.8V Li-Polymer Replacement Battery (HB3742A0EBC)

This is a 3.8V, 2000mAh Li-Polymer replacement cell for the Huawei Ascend P6 smartphone. It fits the Ascend P6, P6-U06, P6-C00, and Ascend G6, among others. Dimensions are 97.89 × 40.67 × 3.44mm — match these against your original cell before installing.

• Ascend P6 and G6 compatibility: These models share the same battery bay dimensions, connector pinout, and BMS communication protocol, which is why a single cell covers the full range. The fuel gauge IC on each device reads cell voltage and charge state over the same internal interface.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on the Ascend P6 platform. The BMS accepted the new cell without triggering overcurrent lockout, and the charge IC stepped through the correct CC/CV phases.
• Fuel gauge recalibration on first use: After installation, disable any fast-charge mode and run one full discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins.

Sudden shutdown at 20–30% on the Ascend P6 after a cell swap

This happens because the fuel gauge IC is still using the discharge curve from the old, degraded cell. When the phone reads 25%, the new cell's actual voltage under modem or display load drops faster than the IC expects. The phone hits its low-voltage cutoff threshold and shuts down before the percentage reaches zero. One full discharge-charge cycle at standard current resets the coulomb counter and corrects the reported percentage.

Phone will not power on after the replacement cell sat in storage

Li-Polymer cells self-discharge during storage. If the cell voltage drops below roughly 2.5V, the BMS enters a protection lockout and blocks current flow to prevent cell damage. The phone shows nothing when you press the power button — no logo, no charging indicator. Connect to a wall charger and leave it for 15–20 minutes; the charge IC will trickle current into the cell until voltage rises above the BMS re-enable threshold of approximately 2.9V, after which normal charging resumes.