Lefant M1 Robot Vacuum Replacement Battery 14.4V 2600mAh

Lefant M1 Robot Vacuum Cleaner Series — 14.4V Li-ion Replacement Battery

This 14.4V 2600mAh (37.44Wh) Li-ion battery fits the Lefant M1 Robot Vacuum Cleaner (4S1P Revision), M210, M210B, and M210P series. It slots into the battery bay and connects to the onboard BMS via the existing harness. When the original cell pack degrades, suction cycles become shorter and the unit returns to dock more frequently — this replacement restores the original voltage curve.

• M1 and M210-series platform fit: These models share a 4S1P lithium cell configuration running a 14.4V nominal rail. The connector pinout and BMS communication protocol are consistent across the M210, M210B, and M210P variants, which is why a single cell pack covers the range.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the M1 platform. The BMS handshake initialised correctly on first contact, charge acceptance was normal from the dock, and the overcurrent protection tripped at the expected threshold during a simulated motor-block test.
• Dock charging behaviour on this model: The M1 series auto-docks after every run and resumes trickle charge immediately. Remove the unit from the dock once the charge indicator shows full — leaving it docked continuously between cleaning cycles accelerates capacity fade in the cell pack faster than normal cycle wear.

Suction dropping before the battery indicator reaches low

The M1's motor draws significantly more current when the filter is partially blocked or the brush roll is tangled. That elevated draw causes the cell voltage to sag under load well before the state-of-charge display reflects it. The BMS reads this voltage drop as a low-battery condition and begins throttling motor power to protect the cells. Clear the filter and brush roll, then recheck — if suction holds steady, the battery is not the root cause.

Motor cutting out mid-cycle and then recovering on its own

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, debris jam, or the unit wedging under furniture — the motor pulls current beyond the BMS protection threshold and the pack shuts the output rail. After a short thermal recovery window, the BMS resets and the motor restarts. Fix the restriction first. If the cutout continues on a clear filter, check that the replacement pack is seated fully and the terminal contact is clean and flush.