Xiaomi P2027-4S2P-MMBK 14.4V Replacement Battery 6800mAh

Xiaomi Mijia Self Cleaning Robot Vacuum Mop Pro — 14.4V Li-ion Replacement Battery (P2027-4S2P-MMBK)

This is a 14.4V, 6800mAh Li-ion replacement battery for the Xiaomi Mijia Self Cleaning Robot Vacuum Mop Pro, Robot Vacuum Mop Cleaner, Dreame W10, and Dreame W10s. It powers the drive motors, suction fan, and mopping system. Fits the OEM specification for part number P2027-4S2P-MMBK.

• Mijia and Dreame platform compatibility: These models share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. The vacuum's main board verifies cell voltage and BMS communication at startup — this replacement meets both checks.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on a Dreame W10 test unit. The BMS correctly negotiated charge termination, and the protection circuit tripped at expected over-discharge thresholds without false cutoffs during motor-start current draw.
• Dock charging habit for this platform: The Mijia and Dreame W10 series dock delivers a maintenance trickle after the battery reaches full charge. Leaving the unit docked indefinitely accelerates capacity fade — charge to full, then remove from the dock if the vacuum will sit unused for more than a few days.

Suction dropping before the battery indicator reaches low

The Mijia Pro's suction motor draws peak current when airflow is restricted — a partially blocked filter forces the motor to work harder, pulling well above rated amps. The BMS reads this sustained overcurrent as a low-voltage sag event and reduces output to protect the cells, which the vacuum interprets as low charge. Clean or replace the HEPA filter first. If suction recovers immediately after, the battery is not the cause. If suction remains weak with a clean filter and a fully charged cell reading below 15.8V under load, the battery has degraded.

Motor cuts out mid-clean and then recovers after a few seconds

This is a BMS overcurrent trip, not a dead battery. It happens when the suction path is restricted enough to spike motor draw beyond the BMS protection threshold — the circuit opens, load drops, the BMS resets, and the motor restarts. The cycle repeats until the restriction is cleared. Check the brush roll for hair wrap, inspect the dust bin seal, and confirm the filter is seated correctly. If the motor still trips on a clear airflow path, check cell voltage at rest — a degraded cell pack that sags below 13V under load will trigger the same protection response.