Scherna T44 Replacement Battery 3.6V 2000mAh Ni-MH

Scherna T44 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 2000mAh Ni-MH rechargeable battery for the Scherna T44 cordless electric shaver. It replaces the original cell when the shaver stops holding a charge or cuts out mid-use. Dimensions are 50.00 × 28.70 × 26.70mm — measure your existing cell before fitting.

• T44 platform fit: The T44 runs a single Ni-MH cell at 3.6V to drive the shaver motor and power the charge indicator circuit. Both functions draw from the same cell, so a degraded battery affects motor torque and indicator accuracy at the same time.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS handshake with the T44 charging circuit and checking that the protection circuit trips correctly at low-voltage cutoff — no false shutdowns during normal use.
• Charging port care on the T44: If you rinse the shaver head, dry the charging port completely before docking — moisture bridging the charge contacts triggers a protection fault the device reports as a dead battery, not a charging error.

Capacity fade from daily partial charging on the T44

Ni-MH cells in shavers degrade faster when charged daily before the cell is meaningfully depleted. The shaver's indicator recalibrates around these shallow cycles, so the battery gauge drifts out of sync with actual cell capacity. Over months, the usable window between "full" and cutoff shrinks. Letting the cell run closer to low before docking — a few times per month — slows this drift.

Shaver motor slows down before the low-battery indicator activates

This happens because the T44 motor draws a short burst of higher current during each cutting cycle, and an aged or partially discharged Ni-MH cell cannot hold its voltage steady under that load. Voltage sags under motor load before it drops far enough to trigger the indicator circuit. The shaver feels underpowered even though the indicator still shows charge remaining. Replacing the cell restores voltage stability — after fitting, charge to full before first use and confirm the indicator reads correctly at 4.2V input from the dock.