Infinuvo Cleanmate S300 Replacement Battery NSAA-12 14.4V

Infinuvo Cleanmate S300 / S400 — 14.4V Ni-MH Replacement Battery (NSAA-12)

This is a 14.4V, 1500mAh Ni-MH replacement battery for the Infinuvo Cleanmate S300 and S400 robotic vacuum cleaners. It replaces OEM part number NSAA-12 and restores power to the drive motors, brush roll, and onboard navigation system. Dimensions are 100.70 x 43.50 x 29.70mm — verify against your existing pack before ordering.

• S300 and S400 compatibility: Both models run the same 14.4V battery architecture with an identical connector and cell configuration. The NSAA-12 part number spans the S300 and S400 production run — the BMS handshake and charge termination logic are the same across both units.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Cleanmate S300 dock. The BMS responded correctly to the charger's delta-V termination signal, cutting charge at full capacity without overrun. Cell voltage at rest settled at approximately 14.4V across all cell groups.
• Dock charging protocol for Ni-MH cells: Do not leave the Cleanmate on the charging dock continuously between cleaning sessions. Ni-MH cells on permanent trickle charge develop capacity fade significantly faster than cells charged only when depleted. Charge to full, then remove the robot from the dock until the next use.

Suction dropping before the battery indicator reaches low

The Cleanmate S300 motor draws higher current when the filter is partially blocked or the brush roll is restricted — the battery pack then sags below the motor's minimum operating voltage before the charge indicator registers low. This is voltage sag under load, not a depleted cell. Clean the filter and check the brush roll for hair wrap first. If suction normalises after cleaning, the pack is not the problem — the motor was simply drawing more than rated current through a restricted airflow path.

Motor cuts out mid-clean, then recovers after a few seconds

This is a BMS overcurrent trip. When sustained suction restriction forces the motor to pull beyond the pack's continuous discharge threshold, the BMS opens the circuit to protect the cells. The pack recovers once current demand drops. Clear the filter and brush chamber completely — if the cutout stops, airflow restriction was the trigger. If trips continue on a clean filter with a new pack, measure resting pack voltage: it should read at or above 14.4V after a full charge cycle.