Klarstein 210XR Cordless Vacuum Replacement Battery 14.4V 3500mAh

Klarstein 210XR Series — 14.4V Ni-MH 3500mAh Replacement Battery

This is a 14.4V Ni-MH battery pack rated at 3500mAh (50.4Wh) for Klarstein cordless stick and handheld vacuums. It fits the 210XR, Cleantouch 210XR, Cleantouch KV8 210C, and KV8 210C models. When the original pack loses capacity or refuses to charge, this replacement restores the vacuum to working condition without replacing the whole unit.

• 210XR and KV8 210C platform compatibility: These models share the same 14.4V battery rail, connector format, and BMS handshake requirements. The cell chemistry is Ni-MH throughout the range, so voltage ramp-up behaviour on charge is consistent across all listed models.
• Bench tested on actual hardware: We ran this pack through charge cycles and monitored BMS cutoff behaviour under simulated motor load. The protection circuit tripped correctly at current thresholds and resumed after load cleared — no false trips under normal suction draw.
• Dock charging habit on the 210XR: Do not leave this vacuum on the charging dock permanently. Ni-MH cells on continuous trickle charge develop capacity fade faster than cells charged only when depleted. Charge to full, then remove from the dock.

Cordless vacuum losing suction before the battery indicator reaches low

This happens when the motor draws more current than the BMS expects, usually because the filter is partially blocked. Restricted airflow forces the motor to work harder, pulling higher current and causing the BMS to reduce output voltage before the cell is actually depleted. The vacuum feels like it's dying early, but the battery still has charge. Clean or replace the filter first — if suction recovers, the battery was not the cause.

Motor cuts out mid-clean then recovers after a few seconds

This is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage or heavily loaded carpet, current spikes past the protection threshold and the BMS shuts off output to protect the cells. After a few seconds the BMS resets and power returns. Clear any blockage, check the filter, and avoid holding the vacuum stationary against a blocked inlet. If trips continue on a clean filter, check that battery voltage after a full charge reads at or above 14.4V with a multimeter.