Xiaomi B105CN Robot Vacuum Compatible Battery 14.4V 6800mAh

Xiaomi Mi Robot Vacuum Mop 2 Pro — 14.4V Li-ion Replacement Battery (BRR-2P4S-5200S)

This 14.4V 6800mAh Li-ion battery pack replaces the original power cell in the Xiaomi Mi Robot Vacuum Mop 2 Pro (B105CN) and compatible models including OMNI 1S, B101CN, and the 41717 series. It powers the drive motors, suction fan, and onboard navigation systems. Capacity is 97.92Wh — matching the OEM specification from the product data.

• Multi-model fit on a shared 14.4V platform: The B105CN, B101CN, OMNI 1S, and 41717 all run the same 4S2P cell configuration and share an identical BMS handshake protocol. Swapping the pack does not require firmware changes or connector adapters — the replacement communicates with the dock charger and vacuum control board directly.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a B105CN unit. The BMS held cell balancing within 20mV across all four series groups, and the vacuum's charge indicator reported state-of-charge accurately throughout testing.
• Dock charging behaviour on the Mi Robot 2 Pro: Remove the vacuum from the dock once charging completes. The Mi Robot 2 Pro applies a low-level trickle current while seated on the dock indefinitely. Over weeks, this compresses cell capacity faster than normal cycling does. Charge to full, then let the unit sit off-dock until the next run.

Suction dropping before the battery indicator reaches low

The Mi Robot Vacuum Mop 2 Pro throttles motor voltage when the pack voltage sags under load — not when state-of-charge hits a threshold. A partially blocked filter increases motor draw, which pulls pack voltage down faster than the indicator anticipates. The vacuum interprets the voltage drop as reduced power demand and backs off fan speed. Clean or replace the HEPA filter first. If suction recovers with a clean filter, the battery was masking a restriction problem, not failing on its own.

Motor cutting out mid-cycle and then restarting a few seconds later

This is a BMS overcurrent trip, not a dead cell. When the suction path is restricted — full dustbin, compressed filter, or tangled brush roll — the motor pulls sustained high current to maintain fan speed. The BMS cuts the circuit to protect the cells, then resets once current demand drops. The vacuum reads this as a soft fault and resumes. Clear the dustbin and brush roll, then check pack resting voltage — it should read between 16.0V and 16.8V when fully charged.