Moser ChroMini 1591 Replacement Battery 1.2V 1200mAh

Moser ChroMini 1591 Series — 1.2V Ni-MH Replacement Battery (1590-7291)

This is a 1.2V, 1200mAh Ni-MH replacement battery for the Moser ChroMini 1591, ChroMini 1591B, ChroMini 1591Q, and Ermila Bella 1590 hair clippers. It replaces OEM part numbers 1590-7291, 1591-0062, and 1591-0067. When the original cell degrades and the clipper loses cutting power or stops holding charge, this cell restores full cordless function.

• ChroMini 1591 and Ermila Bella 1590 platform: These models share the same single-cell Ni-MH architecture, 1.2V rail, and physical form factor — 46.60 x 14.20 x 14.20mm. The same cell fits all four variants without modification to the battery bay or connector orientation.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the ChroMini 1591 platform. The BMS accepted the cell cleanly, completed a full charge cycle without fault, and the motor drew current at expected levels throughout the discharge curve.
• Moisture and the charging port: Dry the charging port completely before connecting to the charger. Water bridging the contacts causes a BMS protection trip that the clipper reports as a dead battery — not a charging fault. A dry cotton swab clears the contacts in seconds.

Capacity fade from daily partial charging on the ChroMini 1591

Ni-MH cells in daily-use clippers are vulnerable to shallow-cycle degradation. Charging the ChroMini 1591 after every short session — without running the cell down — causes the battery to lose usable capacity over weeks. The cell's voltage curve compresses, so the clipper cuts out earlier each use even though the indicator still reads mid-charge. A full discharge-to-cutoff followed by a complete charge cycle recalibrates the gauge and partially recovers lost capacity in a new replacement cell.

Motor speed dropping before the low-battery indicator activates

This is voltage sag under motor load — not a dead battery. As the Ni-MH cell ages, its internal resistance rises. Under the current draw of the clipper motor, terminal voltage drops below what the motor needs before the BMS registers a low-charge state. The indicator lags behind real capacity. Replacing the cell restores a low internal resistance and eliminates the sag. Confirm the new cell is fully charged before first use — charge until the indicator goes solid, then run one full cycle.