Panasonic MC-RS877 Replacement Battery 14.4V 2600mAh

Panasonic MC-RS877 / MC-6RB75 — 14.4V Li-ion Replacement Battery (V97VLP000)

This 14.4V, 2600mAh lithium-ion battery replaces the OEM pack (V97VLP000) in the Panasonic MC-RS877, MC-6RB75, RS767, WRC76, and compatible robotic vacuum models. It slots into the same battery bay and connects to the same BMS circuit as the original. Capacity is rated at 37.44Wh.

• Multi-model fit across the MC-RS877 platform: The MC-RS877, MC-6RB75, RS767, and WRC76 share the same 14.4V voltage rail, connector pinout, and BMS communication protocol — which is why a single replacement pack covers all of them without modification.
• Bench tested on actual hardware: We cycled this cell through the Panasonic charger handshake and confirmed the BMS negotiated charge termination correctly at full capacity. Discharge curves held flat across the motor's working load range with no premature cutoff.
• Dock charging habits matter on this platform: Do not leave the MC-RS877 sitting on its charging dock continuously between runs. Cordless robotic vacuums on permanent dock charge develop capacity fade significantly faster than those charged only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

On the MC-RS877, the motor draws harder when airflow is restricted — a partially blocked filter forces the motor to pull more current than the BMS expects at that state of charge. The BMS interprets this elevated draw as a low-cell condition and begins throttling motor power, which the user reads as suction loss. The battery still has charge remaining; the motor is just being starved to protect the cell. Clean or replace the filter first, then test — if suction holds steady to a lower charge level, the filter was the cause.

Motor cutting out mid-run and then recovering after a pause

This is a BMS overcurrent trip, not a dead battery. When the MC-RS877 hits a sustained blockage — thick carpet pile, debris buildup at the intake — the motor load spikes and the BMS cuts the circuit to protect the cell. The unit recovers after a short rest because the BMS resets once current demand drops. Clear the intake path and check that the brush roll spins freely. If the cutout happens again on clear floors, measure resting cell voltage — it should sit above 12.5V between runs.