Philips HX5350 Replacement Battery 1.2V 2500mAh Ni-MH

Philips HX5350 / HX6302 Series — 1.2V Ni-MH Replacement Battery

This 1.2V 2500mAh Ni-MH cell replaces the internal rechargeable battery in the Philips HX5350, HX5751, HX5752, HX6302, and over 30 additional compatible Philips Sonicare models. When the original cell degrades, brush motor speed drops and charge duration shortens — this cell restores normal operation. Capacity is 2500mAh (3Wh) as specified for this battery slot.

• HX5350 and HX6302 series compatibility: These models share the same cylindrical cell format, voltage rail, and inductive charging circuit. The physical dimensions — 48.70 x 16.82 x 16.82mm — match the OEM cell footprint, so the cell seats correctly against the motor contacts without modification.
• Bench tested on actual hardware: We ran this cell through the inductive charging base on an HX5350 unit and monitored BMS handshake. The cell accepted charge normally, reached full voltage without thermal event, and the motor drew consistent current across multiple brushing cycles.
• Dock charging discipline for Ni-MH cells: Remove the toothbrush from the charging base once fully charged and only return it when the charge is noticeably low. Ni-MH cells in continuous trickle-charge environments — like a bathroom dock — develop voltage depression faster than cells cycled through proper charge and discharge.

Battery fade from continuous dock charging on Philips Sonicare bases

Philips Sonicare bases deliver a low-level inductive charge continuously when a brush sits on them. Ni-MH cells are more sensitive to this than most users expect — constant trickle input causes voltage depression, a condition where the cell's usable voltage drops even though it reads as charged. The result is a brush that feels fully charged but loses motor speed quickly. Cycling the cell properly — charge to full, remove from base, use until low — slows this degradation significantly.

Toothbrush not charging on inductive base after new battery install

If the brush shows no charging activity after fitting a new cell, the most common cause is inductive coil misalignment. The HX5350 base is sensitive to how the brush handle sits — even a few millimetres off-axis reduces energy transfer enough to prevent charging. Remove the brush, reseat it firmly on the base, and confirm the charging indicator activates. If the indicator still does not respond, check that the solder contacts to the new cell are clean and fully connected before assuming a faulty cell.