XRobot M-788 Replacement Battery 14.4V 3000mAh Ni-MH

XRobot M-788 — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 3000mAh Ni-MH replacement battery for the XRobot M-788 robotic vacuum cleaner. It powers the motor drive and cleaning system in the M-788. When the original pack degrades after repeated cycles, suction drops and run time shortens — this battery restores full operating voltage to the unit.

• M-788 motor rail voltage: The M-788 runs its brush motor and suction fan from a shared 14.4V rail. A degraded cell causes voltage sag under load, which the vacuum's control board reads as a low-battery condition even when the indicator hasn't triggered. This pack holds the rail stable under normal motor draw.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the M-788 platform. The BMS held charge acceptance through all cycles without tripping, and the pack delivered rated capacity at the motor's operating current draw.
• Dock charging behaviour on the M-788: Do not leave the M-788 sitting on the charging dock indefinitely after the pack reaches full charge. Ni-MH cells on continuous trickle charge develop capacity fade significantly faster than cells charged only when depleted. Charge to full, then remove the unit from the dock.

Suction dropping before the battery indicator reaches low

This is one of the most common M-788 complaints, and the battery is usually the cause — but not always. A degraded Ni-MH pack loses voltage under load before the cell voltage drops far enough to trigger the low-battery indicator. The vacuum's motor runs at reduced speed, cutting suction noticeably. Replacing the pack resolves this if the filter is clean; if suction still drops after a new battery, clear the filter and check the inlet for partial blockages before assuming a motor fault.

M-788 motor cutting out briefly then recovering mid-clean

When the M-788 encounters a blocked filter or a rug pile that restricts airflow, the motor draws more current than rated to maintain fan speed. If the battery's BMS reads this sustained overcurrent draw, it trips and cuts power momentarily — the unit stops, then resumes once current normalises. This is not a motor fault; it is the BMS protecting the cells. Clear the filter fully, confirm the inlet path is unobstructed, and the cutout will stop occurring at normal operating current.