About this replacement
Mamirobot 416 / K3 / K5 Series — 14.4V Ni-MH Replacement Battery (12SC3000S1P)
This is a 14.4V 3600mAh Ni-MH replacement battery for the Mamirobot robotic vacuum cleaner range. It fits the 416, 461, K3, and K5 models, among others. Voltage and capacity match the OEM spec — 14.4V, 3600mAh (51.84Wh).
- 416 / 461 / K3 / K5 platform fit: These models share a common 14.4V battery bay, connector pinout, and BMS handshake protocol. One cell pack covers the full range without modification.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the K3 platform. The BMS responded correctly to the charger handshake, accepted a full charge without fault codes, and held voltage within spec across sustained motor load.
- Dock charging habit on Mamirobot units: Do not leave the vacuum sitting on the charging dock permanently. Mamirobot robotic vacuums on continuous dock charge develop capacity fade significantly faster than units charged only when depleted. Charge to full, then remove from the dock.
Cordless vacuum losing suction before the battery indicator reaches low
Ni-MH cells lose voltage under load before they lose capacity on the gauge. When the motor pulls hard — dense carpet, a partially blocked filter — cell voltage sags below what the motor controller needs, and suction drops noticeably. The indicator reads mid-charge because it measures resting voltage, not load voltage. Clean the filter first; if sag continues on a new pack, check for a partial blockage in the suction path that is forcing the motor to overdraw.
Motor cuts out mid-clean then recovers after a few seconds
This is a BMS overcurrent trip, not a dead battery. When suction is restricted — clogged filter, tangled brush roll, or carpet fibres blocking the intake — the motor draws more current than the BMS threshold allows, and the pack shuts off momentarily to protect the cells. It resets once current demand drops. Clear the filter and check the brush roll before assuming the battery is faulty. If the cutout continues after cleaning, verify the filter is fully seated and not bypassed.