Huawei Honor 8X Max Replacement Battery 3.85V 4900mAh

Huawei Honor 8X Max — 3.85V Li-Polymer Replacement Battery (HB4073A5ECW)

This 3.85V, 4900mAh Li-Polymer battery replaces the OEM HB4073A5ECW cell in the Huawei Honor 8X Max (ARE-AL00). It fits the large-screen 2018 Android handset where the original cell has degraded through repeated charge cycles. Capacity is rated at 18.87Wh, matching the factory specification for this model.

• Honor 8X Max and ARE-AL00 fit: Both model designations run the same 3.85V battery rail, use the same flex connector, and communicate with the same BMS over the phone's charge IC. One cell covers both variants.
• Bench tested on actual hardware: We ran this cell through charge, load, and BMS handshake verification. The protection circuit responded correctly to overvoltage and over-discharge thresholds, and the charge IC accepted the cell without error flags on the first cycle.
• Fuel gauge recalibration on first use: After installation, disable Huawei's SuperCharge and run one full discharge-charge cycle at standard 5V input. The phone's coulomb counter is still calibrated to the old cell's discharge curve. One slow cycle lets it map the new cell before fast charging pushes higher current into an uncalibrated gauge.

Sudden shutdown at 20–30% on the Honor 8X Max after a cell swap

This is a voltage cliff issue, not a capacity fault. The Honor 8X Max's modem and 6.9-inch display draw sharp current spikes. If the fuel gauge IC is still mapped to the old cell's internal resistance profile, it miscalculates remaining charge and the phone cuts out before the gauge hits zero. The fix is a full discharge to automatic shutdown, then a full charge without interruption. After that single cycle, the coulomb counter recalibrates and the premature cutoff stops.

SuperCharge not activating after replacement

Huawei's proprietary fast-charge protocol requires a BMS handshake before the charge IC ramps voltage above 5V. On the first cycle with a new cell, the phone's charge controller may withhold the high-current profile until it has completed one baseline charge. Use the original Huawei cable and adapter — third-party chargers that spoof USB-PD will not trigger SuperCharge on this platform regardless of cell condition. If SuperCharge still does not activate after one full standard cycle, check the flex connector seating at both the battery and board terminals.