Mamibot ExVac 680S Replacement Battery 14.4V 2600mAh

Mamibot ExVac 680S / ExVac 880 — 14.4V Li-ion Replacement Battery

This 14.4V 2600mAh (37.44Wh) Li-ion battery fits the Mamibot ExVac 680S and ExVac 880 robotic vacuum cleaners. It replaces the original cell when capacity has faded and the unit can no longer complete a full cleaning cycle. No OEM part number is published for this battery — match by model number before ordering.

• ExVac 680S and 880 platform fit: Both models use the same 14.4V battery bay, connector pinout, and BMS communication protocol, which is why a single cell covers the range. Voltage must match exactly — a lower-rated cell will trigger undervoltage cutoff mid-cycle.
• Bench tested on actual hardware: We cycled this cell through the ExVac charging dock and confirmed the BMS completed a full charge handshake without fault codes. The protection circuit responded correctly to simulated overcurrent, cutting power and resetting cleanly on reconnection.
• Dock charging discipline for robotic vacuums: Do not leave the ExVac sitting on its dock between every use as a matter of habit. Continuous trickle charging through the dock accelerates capacity fade in Li-ion cells faster than normal discharge cycling. Charge to full, then remove from the dock until the next use.

Suction dropping before the battery indicator reaches low

The ExVac 680S draws higher current when suction is restricted — a partially blocked filter forces the motor to work harder, pulling more amps than the BMS allows under sustained load. The BMS reads this as an overcurrent condition and reduces power to the motor before the battery is actually depleted. The indicator still shows charge remaining because the cell voltage is fine — the problem is current draw, not capacity. Clean or replace the filter first; if suction recovers, the battery is not the fault.

Motor cuts out mid-run and then recovers on its own

This is a BMS overcurrent trip, not a dead battery. When the ExVac hits dense carpet or a partial blockage, motor current spikes sharply. The protection circuit cuts output to prevent cell damage, then resets once current drops back within range. If this happens repeatedly, check that the dustbin is not full and the intake path is clear. A cell with significant capacity fade will also sag in voltage under motor-start load — if the resting voltage measures below 12.5V on a charged pack, the cell needs replacement.