Remington 4235 010 20455 Toothbrush Replacement Battery 2.4V 700mAh

Remington 4235 010 20455 — 2.4V Ni-MH Replacement Battery

This is a 2.4V, 700mAh Ni-MH replacement battery for Remington electric toothbrushes using OEM part numbers 4235 010 20455 and 4238 118 20588. It sits inside the toothbrush handle and powers the oscillating motor that drives the brush head. When the original cell degrades and no longer holds a charge, this replacement restores full motor function without buying a new unit.

• Toothbrush handle compatibility: Remington models using these two OEM part numbers share the same 2.4V cell format, connector orientation, and internal handle dimensions — 44.30 x 21.20 x 11.50mm. Swapping to a different cell size or voltage will either misfit the housing or overload the motor driver circuit.
• Bench tested on actual hardware: We cycled this cell through the inductive charging base and confirmed the BMS accepted charge normally, with voltage climbing cleanly from depleted state to full charge without false cutoff triggers.
• Dock charging habit on Ni-MH cells: Remove the toothbrush from the charging base once fully charged and only return it when the cell is below 30%. Continuous trickle charging from an inductive base accelerates capacity fade on Ni-MH cells faster than partial-cycle use.

Toothbrush losing brushing power before the battery indicator shows low

Ni-MH cells develop a voltage depression effect after repeated shallow charge cycles — the cell voltage drops under motor load even though resting voltage reads normal. The brush motor loses torque noticeably before the indicator triggers a low-battery warning. This is a cell-level issue, not a motor fault. Replacing the cell and cycling it through full discharge-to-charge sequences resets the effective capacity.

Toothbrush not charging on the base after battery replacement

Inductive charging bases are sensitive to alignment — if the brush head is not fully seated and the handle is not sitting flush, the coil coupling is too weak to transfer enough current to initiate charging. Check that the handle clicks or seats completely onto the base post with no tilt. Also confirm the replacement cell's solder connections are secure, as a loose tab breaks the charge circuit before current reaches the cell. If the base light flickers but charging doesn't hold, reseat the handle and allow two full charge cycles.