Rowenta Tondeuse 2.4V Ni-MH Replacement Battery 2000mAh

Rowenta Tondeuse Wet & Dry Series — 2.4V Ni-MH Replacement Battery (CS-00135747)

This is a 2.4V, 2000mAh Ni-MH replacement battery for the Rowenta Tondeuse Wet & Dry trimmer and clipper range. It fits the TN5100F0/3M0, TN5120F0/3M0, and TN5140F0/3M0 models, plus one additional variant in the same series. Swap it in when the original cell no longer holds a charge or fails to complete a full trim cycle.

• TN51xx series fit: All TN51xx models in this range share the same 2.4V two-cell Ni-MH configuration, identical connector pinout, and physical cell dimensions of 49.30 × 28.50 × 15.50mm. One replacement covers the full group without modification.
• Bench tested on actual hardware: We ran charge and discharge cycles on this cell using the original Rowenta charging circuit. The cell accepted a full charge without thermal runaway, and the terminal voltage held steady at 2.4V under load across repeated cycles.
• Ni-MH cycle care for trimmers: Ni-MH cells in low-drain grooming tools suffer from voltage depression when repeatedly topped up from a partial state. Run the trimmer until it slows noticeably, then charge fully — this keeps the cell's usable voltage window from compressing over time.

Why the Tondeuse Wet & Dry loses cutting power before the charge runs out

Ni-MH cells develop a memory-like voltage depression when cycled repeatedly from partial discharge. The trimmer motor draws enough current to expose that compressed voltage window, so cutting torque drops even though the cell still has stored charge. This is not a fault with the cell itself — it is a cycle history issue. Conditioning the replacement cell with two or three full discharge-to-charge cycles resets the usable voltage range and restores motor torque.

Replacement cell not charging after fitting

A new Ni-MH cell shipped in storage state can read below 2.0V at the terminals, which some Rowenta chargers interpret as a dead or absent cell and refuse to initiate a charge. Place the trimmer on charge for at least 30 minutes without interruption — the charger typically needs the cell to climb above 2.1V before the charge circuit latches on properly. If the charger LED still shows no activity after 30 minutes, disconnect, wait 60 seconds, and reconnect. Confirm the charger output is delivering at least 2.4V DC before assuming a fault with the cell.