Nintendo Wii Remote NC-WR01BA Replacement Battery 2.4V 400mAh

Nintendo Wii Remote — 2.4V Ni-MH Replacement Battery (NC-WR01BA)

This is a 2.4V, 400mAh Ni-MH rechargeable battery for the Nintendo Wii Remote controller. It fits the standard Wii Remote (Part No: NC-WR01BA) and restores wireless operation without replacing the whole controller. Voltage and cell size match the original specification exactly.

• Wii Remote platform fit: The Wii Remote uses a 2.4V Ni-MH cell pack with a specific connector and BMS handshake tied to the console's charge management circuit. Swapping to a mismatched chemistry or voltage breaks that handshake and triggers charge refusal at the dock.
• Bench tested on actual hardware: We cycled this cell through the Wii Remote's charge IC and confirmed the BMS accepted the cell without fault flags. Discharge under combined wireless and rumble load held voltage above the cutoff threshold across the full cycle.
• First-cycle calibration on Wii Remote: Run one complete wireless play session to automatic cutoff before recharging. The Wii Remote's fuel gauge IC sets its empty reference point against the first full discharge — skipping this step causes the battery indicator to read inaccurately for several sessions.

Why the Wii Remote fuel gauge jumps or reads wrong after a cell swap

The Wii Remote uses a simple coulomb-counting fuel gauge IC that tracks charge relative to a stored empty reference. When you install a new cell, that reference no longer matches the new cell's actual discharge curve. The gauge can show full, then jump to one bar, then back up — all without a fault. One complete discharge-to-cutoff cycle rewrites the empty reference and the gauge stabilises. After that first cycle, readings return to normal.

Wii Remote disconnecting before the battery indicator reaches empty

The Wii Remote draws current from two loads simultaneously during active play — the wireless radio and the rumble motor. That combined draw causes a brief voltage sag that can dip below the controller's disconnect threshold even when the fuel gauge still shows charge remaining. A new Ni-MH cell needs three to five charge cycles to reach rated capacity and reduce internal resistance. Until then, voltage sag under peak load is higher than normal. Fully cycle the battery three times and the sag drops — the premature disconnect stops.