Carneo 400 Replacement Battery 14.4V 2000mAh Ni-MH

Carneo 400 / SC400 — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 2000mAh Ni-MH replacement battery for the Carneo 400 and SC400 robotic vacuum cleaners. It slots into the battery bay and restores power to the motor and navigation system when the original cell has degraded. Capacity is 2000mAh (28.8Wh), matching the factory specification.

• 400 and SC400 platform fit: Both models share the same 14.4V motor rail, battery bay dimensions, and connector pinout — the same cell covers both. The BMS on these units monitors cell voltage and temperature; Ni-MH chemistry is required because the charger profile expects the voltage drop signature that Ni-MH produces at full charge, not a Li-ion curve.
• Bench tested on actual hardware: We cycled this cell through discharge under a sustained motor load and confirmed the BMS accepted it without a protection trip. Voltage held above the low-cutoff threshold through normal operating draws across hard floor and low-pile carpet simulation.
• Dock charging habit on robotic vacuums: Do not leave the Carneo 400 sitting on the dock between every cleaning cycle. These units trickle-charge when docked, and Ni-MH cells lose capacity significantly faster under continuous trickle current. Charge to full, remove from dock, and return it only when the cell needs a charge.

Suction dropping before the battery indicator reaches low

This happens when the motor is working harder than its rated draw — usually because the filter is partially blocked or the brush roll is restricted. The extra current causes voltage to sag at the cell terminals even though the battery still holds charge. The BMS reads the sag as a near-depleted state and reduces power to the motor. Clean the filter and check the brush roll before assuming the battery is at fault.

Replacement battery not charging on the dock

The Carneo 400 charger uses the voltage drop at end-of-charge — a Ni-MH characteristic — to terminate the charge cycle. If the replacement cell sits at full charge before docking, the charger may not detect a sufficient voltage drop and terminates almost immediately, making it appear the battery never charged. Start a cleaning cycle to partially discharge the cell, then dock it. The charger should then detect a proper charge curve and run through a full cycle.