Asus ZenFone Max Pro M1 Replacement Battery 3.85V 4900mAh

Asus ZenFone Max Pro M1 — 3.85V Li-Polymer Replacement Battery (0B200-02870200)

This is a 4900mAh, 3.85V lithium-polymer battery for the Asus ZenFone Max Pro M1 and Max Pro M1 Dual SIM (ZB602KL). It replaces OEM part numbers 0B200-02870200 and C11P1706. Fit the original battery degrading through charge cycles and no longer holding capacity.

• ZB602KL platform compatibility: The ZenFone Max Pro M1 and its Dual SIM TD-LTE variant share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all variants accept this 3.85V cell without modification.
• Bench tested on actual hardware: We cycled this cell on a ZB602KL unit and monitored BMS communication through full charge and discharge. The protection circuit engaged correctly at both cutoff thresholds, and the fuel gauge IC accepted the cell without error flags on the second full cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC build an accurate discharge curve against the new cell before the charge IC pushes higher current into an uncalibrated state.

Sudden shutdown at 20–30% on the ZenFone Max Pro M1

The Snapdragon 636 in this phone draws a sharp current spike when the modem switches between LTE bands or when the display jumps to full brightness. If the cell's internal resistance is elevated — either from age or from a new cell that hasn't been calibrated — voltage can sag below the BMS cutoff threshold momentarily, triggering a hard shutdown even though the fuel gauge still shows charge remaining. This is a voltage cliff event, not a capacity failure. One full discharge-charge cycle at standard rate recalibrates the coulomb counter and typically eliminates false shutdowns.

Phone not turning on after the replacement battery sat in storage

Lithium-polymer cells self-discharge during storage. If this battery shipped or sat unused long enough to drop below approximately 2.5V per cell, the BMS will lock out charging as a protection measure — the phone appears completely dead even on charge. Connect the device to a 5V/1A charger (not a fast charger) and leave it for 20–30 minutes without pressing the power button. Most BMS circuits on this platform accept a trickle pre-charge recovery at that rate and will re-initialise once the cell voltage climbs above the 2.8V recovery threshold.