Xiaomi P2027-4S2P-MMBK 14.4V Replacement Battery 5200mAh

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

This is a 14.4V Li-ion replacement battery rated at 5200mAh (74.88Wh) for the Xiaomi Mijia Self Cleaning Robot Vacuum Mop Pro and compatible models. It fits the main battery bay and connects to the vacuum's onboard BMS via the original multi-pin connector. Capacity figure is taken directly from product data — 5200mAh at 14.4V nominal.

• Mijia Pro, Robot Vacuum Mop Cleaner, Dreame W10 and W10s compatibility: These models share the same 14.4V rail, connector pinout, and BMS handshake protocol. Swapping cells between them works because the charge controller negotiates with the same packet structure across the platform.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Mijia Pro dock. The BMS negotiated charge termination correctly, cell balancing activated across all four series groups, and protection tripped at expected overcurrent thresholds without false cutoffs.
• Dock charging behaviour on this robot: The Mijia Pro auto-returns to dock after every cycle and trickle-charges continuously. Remove the battery or power off the dock when the unit sits unused for more than two days — sustained trickle current on a full Li-ion cell accelerates capacity fade measurably faster than periodic charge cycles.

Suction dropping before the battery indicator reaches low on the Mijia Pro

This happens when the motor draws above its rated current — usually from a partially blocked filter or restricted brush roll — and the cell voltage sags under load before the state-of-charge indicator registers low. The BMS reads voltage, not remaining capacity directly, so a sagging cell under high draw looks depleted even when resting voltage is still acceptable. Clean the HEPA filter and check the brush roll for hair wrap before blaming the battery. If suction recovers immediately after cleaning the filter, the cell is fine — the motor was simply pulling more current than the battery could deliver cleanly under restriction.

Robot vacuum motor cutting out mid-cycle then restarting on its own

This is a BMS overcurrent trip, not a power failure. When suction is restricted — blocked inlet, full dustbin, or clogged filter — the motor pulls sustained current above the BMS protection threshold and the circuit opens to prevent cell damage. The BMS resets after a short thermal recovery window, which is why the motor restarts without intervention. Clear the blockage, empty the dustbin, and rinse the filter before the next cycle. If the trip recurs on an unobstructed run, measure resting cell voltage — a degraded cell sitting below 14.0V at rest will trip overcurrent earlier under normal motor load.