Xiaomi 34264 Replacement Battery 14.4V 6800mAh Li-ion

Xiaomi Mi Robot Vacuum-Mop 2 Ultra — 14.4V Li-ion Replacement Battery (P2150-4S2P-MMBK)

This 14.4V, 6800mAh Li-ion battery replaces the OEM P2150-4S2P-MMBK cell pack used in the Xiaomi 34264, BHR5195EU, and Mi Robot Vacuum-Mop 2 Ultra cordless vacuums. It restores suction power when the original battery has faded or failed. Capacity figure is taken directly from product data at 97.92Wh.

• 34264 / BHR5195EU platform fitment: These models share a common 14.4V four-cell series architecture and use the same connector pinout and BMS communication protocol — that is why one replacement covers all three fit models without modification.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on the Mi Robot Vacuum-Mop 2 Ultra platform. The BMS held stable cutoff voltage under simulated floor-cleaning load and recovered cleanly from the motor-start current draw without tripping overcurrent protection.
• Dock charging habit for Mi Robot Vacuum models: Do not leave this vacuum parked on its charging dock permanently. Continuous dock contact keeps the cells in a trickle-charge state that degrades capacity faster than normal cycling. Charge the battery to full, then break dock contact until the next clean.

Suction dropping before the battery indicator reaches low

The Mi Robot Vacuum-Mop 2 Ultra measures battery state by resting voltage, not under-load voltage. When a filter is partially blocked or the brush roll is restricted, the motor draws above its rated current. Voltage sags under that elevated draw, but the indicator — reading a brief resting voltage — still shows mid-charge. The fix is mechanical: clean the HEPA filter and clear the brush roll, then retest. If suction recovers, the battery was never the cause.

Motor cuts out mid-clean and then restarts on its own

This is a BMS overcurrent trip, not a dead battery. Sustained restricted airflow — from a clogged filter or a blocked intake — forces the motor to pull current beyond the BMS threshold, triggering a temporary shutdown. The BMS resets after a short cooldown, which is why the vacuum restarts by itself. Clear the filter and intake path, then verify the resting pack voltage sits above 13.0V before running another cleaning cycle.