Mamibot eXVAC 890 Replacement Battery 14.4V 5200mAh

Mamibot eXVAC 890 — 14.4V Li-ion Replacement Battery (SUN-INTE-279)

This 14.4V, 5200mAh Li-ion battery pack replaces the original SUN-INTE-279 cell in the Mamibot eXVAC 890 robotic vacuum. It also fits the Garlyn SR-800 Max, which shares the same voltage rail and connector format. Capacity figure is taken directly from product data at 74.88Wh.

• eXVAC 890 and Garlyn SR-800 Max compatibility: Both units run the same 14.4V motor platform with an identical BMS handshake and connector pinout, which is why one pack covers both models without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the eXVAC 890 platform. The BMS balanced cells correctly, held voltage above the motor's minimum threshold across the full cycle, and triggered protection cutoff at the correct low-cell threshold.
• Dock charging habit for robotic vacuums: Do not leave the eXVAC 890 sitting on the charging dock between uses. Robotic vacuums on permanent dock contact receive a low-level trickle charge that degrades Li-ion capacity faster than regular charge-and-remove cycles. Charge to full, then lift the unit off the dock.

Suction dropping before the battery indicator reaches low

A restricted filter forces the motor to draw harder to maintain airflow. That extra current pull drags the pack voltage down faster than a clean-filter run. The result is noticeable suction loss while the indicator still shows adequate charge. Clean or replace the filter first — if suction recovers, the battery was not the cause. If the pack itself is aged, cell voltage sags under that elevated load even though the state-of-charge reading looks fine.

Motor cuts out mid-cycle and then recovers after a pause

This is a BMS overcurrent trip, not a mechanical fault. When the vacuum hits a carpet edge or partial blockage, motor current spikes briefly above the BMS protection threshold and the pack disconnects to protect the cells. After a short pause the BMS resets, power returns, and the vacuum resumes. Check the brush roll for hair tangles and the filter for restriction — both cause sustained high-draw events that trigger this trip repeatedly. A healthy battery on a clean machine should not trip the BMS under normal floor transitions.