Bella 1590 Replacement Battery 1.2V 1800mAh Ni-MH

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

This is a 1.2V, 1800mAh Ni-MH rechargeable cell for the Bella 1590 electric shaver and its variants, including the 1590B, 1590C, and 1591. It restores power to the shaver's motor when the original cell has aged out or lost the ability to hold a charge. Capacity is rated at 1800mAh (2.16Wh).

• 1590 series compatibility: The 1590, 1590B, 1590C, and 1591 all use the same single-cell Ni-MH configuration on a shared voltage rail. The cell dimensions — 49.90 x 14.30 x 14.30mm — match the original housing exactly, so no modification is needed to fit the compartment.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a shaver motor load. The BMS held within expected cutoff thresholds and the cell reached full rated capacity without thermal anomaly.
• Charging port care after cleaning: If you rinse or wipe the shaver with cleaning products, dry the charging port completely before docking. Moisture bridging the charging contacts can trigger a protection fault that the shaver reports as a dead battery rather than a charging error.

Capacity fade from daily partial charging on the Bella 1590

Ni-MH cells used in shavers are vulnerable to shallow-cycle degradation when charged daily before the cell is meaningfully depleted. Over months, the battery's usable capacity drifts down as charge memory compresses the effective voltage window. The shaver's indicator is calibrated against a full-capacity cell, so it begins to drift — showing partial charge when the cell is already near depletion. Running the cell down to near-empty before a full recharge periodically helps recalibrate the indicator and slows further capacity compression.

Shaver motor speed dropping before the indicator shows empty

Ni-MH cells experience voltage sag under motor load before the BMS cutoff threshold is reached. The shaver motor draws a sharp current spike at startup, which pulls the cell voltage down faster than the indicator responds. This shows up as sluggish blade speed or audible motor slowdown while the indicator still shows usable charge remaining. If this happens with a new cell, check that the charging contacts are clean and making full contact — oxidised dock pins reduce charge acceptance and leave the cell starting each session below full voltage.