Kärcher CVH 2 Replacement Battery 7.4V 2000mAh Li-ion

Karcher CVH 2 — 7.4V Li-ion Replacement Battery (9.774-316.0)

This is a 7.4V, 2000mAh Li-ion battery for the Karcher CVH 2 cordless handheld vacuum cleaner. It replaces OEM part number 9.774-316.0 and restores power to the CVH 2 when the original cell has degraded or failed. Fits the CVH 2 body directly — same connector, same BMS voltage profile.

• CVH 2 platform fit: The CVH 2 runs a 7.4V two-cell Li-ion pack with a specific connector orientation and BMS handshake that controls both charge cutoff and motor start. This replacement matches that voltage rail and connector, so the vacuum's charge indicator and low-battery cutoff behave as expected.
• Bench tested on actual hardware: We ran this cell through full charge cycles and checked BMS cutoff under simulated motor load. The protection circuit triggered correctly at low-voltage threshold and reset cleanly on reconnection to the charger.
• Dock charging habit on the CVH 2: The CVH 2 is often left on its charging dock between uses. Li-ion cells in this voltage range degrade faster under continuous trickle charge than under charge-then-remove cycles. Charge to full and unplug — do not leave the vacuum docked permanently.

Suction dropping before the battery indicator reaches low

The CVH 2 motor draws more current when the filter is partially blocked, because it works harder to pull airflow through restricted mesh. That extra draw causes the cell voltage to sag under load before the indicator circuit sees a true low-battery condition. The result is weak suction while the indicator still shows charge remaining. Clean the filter first — if suction recovers, the battery is not the cause. If suction stays weak with a clean filter and a charged cell, the cell's internal resistance has risen and the pack needs replacement.

Motor cuts out mid-use then restarts after a few seconds

This is a BMS overcurrent trip, not a motor fault. When suction is restricted — blocked nozzle, clogged filter, or pressed hard against upholstery — current draw spikes past the protection circuit's threshold. The BMS shuts the output to protect the cell, then resets once current drops. Clear the blockage and check the filter before assuming the battery is at fault. If the cutout happens on a clean machine with an aged original pack, the cell's capacity has dropped enough that even normal draw hits the trip threshold — that is when a replacement cell fixes it.