ProfiLine 1590 Shaver Replacement Battery 1.2V 1800mAh Ni-MH

ProfiLine 1590 / 1591 Series — 1.2V Ni-MH Replacement Battery

This is a 1.2V 1800mAh Ni-MH cell that fits the ProfiLine 1590, 1590B, 1590C, 1591, and over a dozen related cordless electric shaver models. It replaces the original rechargeable cell when the shaver loses charge capacity or stops holding a usable charge. Voltage and capacity match OEM spec exactly — 1.2V, 1800mAh (2.16Wh).

• 1590 series compatibility: The 1590, 1590B, 1590C, and 1591 share the same single-cell Ni-MH configuration and connector format. Voltage rail is identical across the range, so one cell fits all covered models without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 1590 platform. The BMS accepted the cell without fault codes, and the charge indicator tracked correctly from flat to full across multiple cycles.
• Shaver contact drying: If you rinse the shaver head under water, let the charging port air dry completely — at least 30 minutes — before docking. Moisture bridging the two charging pins triggers a BMS protection fault that the shaver reports as a dead battery rather than a charging error.

Capacity fade from daily partial charging on the 1590

Ni-MH cells in shavers degrade faster when recharged daily before the cell is meaningfully depleted. The 1590's charge circuit tops the cell up rather than running a full cycle, so the cell never fully discharges. Over several months, the usable capacity window narrows and the indicator drifts — showing full charge while actual cell capacity has dropped significantly. Replacing the cell resets this, but the new cell benefits from occasional full discharge cycles rather than nightly top-ups.

Motor speed dropping before the low-battery indicator activates

This happens when the cell's internal resistance has risen enough to cause voltage sag under motor load, but not enough to trigger the BMS cutoff threshold. The shaver's motor draws a short current spike at startup and during thick beard passes — if cell resistance is high, voltage drops below the motor's operating point before the indicator registers low. The shaver feels like it's losing power randomly, but the display still shows charge remaining. A cell measuring below 1.0V at rest under light load confirms the fault — replace the cell.