Huawei P50 Pro Replacement Battery HB536479EFW 3.87V 4250mAh

Huawei P50 Pro — 3.87V Li-Polymer Replacement Battery (HB536479EFW)

This is a 3.87V, 4250mAh Li-Polymer battery for the Huawei P50 Pro, covering model variants JAD-LX9, JAD-L09, JAD-AL50, and one additional JAD-series configuration. It replaces part number HB536479EFW. Fit is confirmed by connector type, cell dimensions (77.30 × 63.50 × 5.20mm), and BMS handshake protocol.

• P50 Pro JAD-series compatibility: All covered variants share the same voltage rail, flex connector layout, and BMS communication line. The fuel gauge IC on these models expects the same charge curve — this cell meets that spec without triggering a firmware fault.
• Bench tested on actual hardware: We cycled this cell through charge, discharge, and fast-charge initiation on a JAD-series unit. The BMS accepted the cell handshake, charge current stepped up correctly through CC/CV phases, and no thermal flags were raised.
• First-cycle fast charge hold-off: On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes voltage into an uncalibrated coulomb counter — preventing early percentage errors.

Sudden shutdown at 20–30% on the replacement cell

The P50 Pro's fuel gauge IC stores the discharge curve of the old, degraded cell. When a fresh cell with a steeper voltage cliff is installed, the IC misreads remaining capacity. Under modem transmission or peak screen load, the cell voltage drops below the BMS cutoff threshold before the gauge reaches 0% — so the phone shuts off mid-use. One full discharge-charge cycle on basic charging recalibrates the coulomb counter. After calibration, the percentage reading and actual cutoff voltage align. Target a resting voltage of 3.87V at 100% as confirmation the IC has re-anchored.

USB-PD fast charge not accepted on first cycle after replacement

After fitting a new cell, the charge IC on the P50 Pro may fall back to standard 5W charging and refuse to negotiate the Huawei SuperCharge protocol. This happens because the BMS treats an uncalibrated cell as an unknown state and limits input current as a precaution. Complete one full charge cycle at standard rate first — plug in without a SuperCharge adapter. On the second cycle, reconnect the SuperCharge adapter and the charge IC will re-negotiate the higher current tier normally.