About this replacement
Huawei P7 / Ascend P7 Series — 3.8V Li-Polymer Replacement Battery (HB3543B4EBW)
This is a 3.8V, 2460mAh (9.35Wh) lithium-polymer replacement battery for the Huawei P7 smartphone. It fits the P7, Sophia, Ascend P7-L09, and Ascend P7 variants. It replaces OEM part number HB3543B4EBW when the original cell has degraded or failed.
- P7 and Ascend P7 platform fit: All listed variants — including Sophia and the L09 network variant — share the same physical cell envelope, connector pinout, and BMS handshake. The 113.41 × 41.91 × 3.36mm footprint matches the factory bay without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on P7 hardware. The BMS communicated correctly with the charge IC on first connection, and the device accepted a full charge without flagging an unrecognised cell error.
- 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 actual discharge curve before high-current charging pushes current into an uncalibrated cell.
Why the P7 reports wrong battery percentage after a cell swap
The P7 uses a fuel gauge IC that builds its capacity model from the original cell's discharge curve. When a new cell goes in, the IC is still referencing the old degraded curve. This causes the reported percentage to drift from actual charge state — often showing full when the cell is not, or dropping suddenly near 20–30%. One full discharge-charge cycle, without interruption, rewrites the reference curve to match the new cell. After that cycle, percentage reporting stabilises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops below the SoC threshold faster than the fuel gauge predicts under load. The P7's modem and display together can draw enough current to pull cell voltage below 3.4V in milliseconds — the protection circuit interprets this as a critical undervoltage and cuts power. The percentage displayed at shutdown looks high because the fuel gauge IC hasn't yet recalibrated to the new cell. Run one full uninterrupted discharge-charge cycle and confirm the cell holds above 3.6V under screen-on load before concluding the cell is faulty.