Klarstein M-288 Cordless Vacuum Replacement Battery 14.4V 3000mAh

Klarstein M-288 / M-488 Cleanfriend — 14.4V Ni-MH Replacement Battery

This is a 14.4V 3000mAh Ni-MH replacement battery for the Klarstein M-288 and Cleanfriend Cleaner M-488 cordless stick vacuums. It slots into the battery compartment and restores suction power when the original cell has lost capacity from age or charge cycling. Capacity is rated at 43.2Wh — matching the original specification.

• M-288 and M-488 compatibility: Both models run the same 14.4V battery rail and use an identical physical housing with the same connector orientation. One replacement cell covers both units without any modification.
• Bench tested on actual hardware: We cycled this battery through the vacuum's motor draw under load — including carpet and crevice tool use — and confirmed the BMS held without tripping on normal sustained suction demand.
• Dock charging habit on these vacuums: Do not leave the M-288 or M-488 sitting on the charging dock permanently. These units use a simple trickle charge circuit that does not cut off automatically at full. Continuous dock time degrades Ni-MH cells faster than deliberate charge-and-remove cycles. Charge fully, then lift the unit off the dock.

Suction dropping before the battery indicator reaches low

Ni-MH cells under partial discharge can show adequate indicator voltage while actual capacity under motor load has already dropped. The M-288 motor draws harder when airflow is restricted — a partially blocked filter forces higher current, which causes voltage sag earlier in the discharge curve. This makes the vacuum feel like it's losing suction prematurely even though the indicator still reads mid-range. Clean the filter first, then retest — a clear airpath reduces motor draw and flattens the sag.

Motor cuts out mid-use then recovers after a short pause

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked nozzle, saturated filter, or hair wrap at the brush roll — the motor pulls beyond the BMS current limit and the cell disconnects to protect itself. After 30–60 seconds the BMS resets and power returns. Clear the blockage at the nozzle and brush roll, then check that the filter is clean before running the vacuum again. If the trip repeats with a clear airpath, measure resting voltage — a healthy cell at full charge should read at least 16.8V open circuit.