About this replacement
Karcher VCH2 / 1.198-400.0 — 7.4V Li-ion Replacement Battery (1.198-400.0)
This 7.4V, 2500mAh Li-ion battery replaces the original pack in Karcher's VCH2 handheld cordless vacuum. It fits models listed under part number 1.198-400.0. Capacity matches the factory spec at 18.5Wh — no downgrade from the original.
- VCH2 platform compatibility: The VCH2 and 1.198-400.0 share a single battery format — same voltage rail, same cell footprint, same BMS connector pinout. One pack covers both.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the VCH2 platform. The BMS handshake completed correctly, protection thresholds triggered at expected voltages, and the vacuum's motor received full rated voltage under load.
- Dock charging habit on the VCH2: The VCH2 charging dock does not cut off once full — it continues to pass current. Remove the vacuum from the dock once the charge indicator shows complete. Leaving it docked continuously accelerates capacity fade in the cell over time.
Suction dropping before the battery indicator reaches low on the VCH2
The VCH2 motor draws more current when airflow is restricted — a partially blocked filter forces the motor to work harder than rated. That extra draw causes the cell voltage to sag under load even when the battery still reads as charged. The BMS interprets sustained voltage sag as a protection event and reduces output to the motor. Clean or replace the filter first, then retest — if suction holds steady, the battery is not the cause.
VCH2 motor cutting out mid-use and recovering after a short pause
This pattern is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked nozzle, clogged filter, or debris jam — the motor pulls current beyond the BMS threshold and the pack shuts output off as a protective response. The brief pause allows the BMS to reset, which is why the vacuum starts again. Clear the blockage completely, then verify the filter is clean. If the cutout stops, the pack is functioning correctly — the fault was upstream of the battery.