Welpe R30 Cordless Vacuum Replacement Battery 14.8V 2600mAh

Welpe R30 / R35 — 14.8V Li-ion Replacement Battery

This is a 14.8V, 2600mAh Li-ion battery pack for the Welpe R30 and R35 cordless vacuum cleaners. It replaces the original pack when the cell can no longer hold enough charge to complete a cleaning run. Voltage and cell count match the original, so the motor draws correctly from first use.

• R30 and R35 compatibility: Both models run the same 14.8V four-cell Li-ion architecture and use the same connector and BMS communication protocol. A battery built for one works in the other without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on R30 hardware. The BMS held cutoff voltage correctly at the low end and accepted charge termination from the standard Welpe charger without error codes.
• Dock charging habit on the R30/R35: Do not leave the vacuum sitting on the charging dock permanently. Continuous dock charging causes trickle charge damage that degrades cell capacity faster than normal cycling. Charge the pack to full, then remove it from the dock.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than rated — usually because a partially blocked filter is forcing it to work harder. The BMS detects the elevated draw and begins throttling output voltage before the fuel gauge trips its low-battery threshold. The vacuum feels like a dying battery when the actual problem is airflow restriction. Clean or replace the filter first, then retest — motor current should drop back to normal and suction will hold steady across the full charge cycle.

Motor cutting out mid-clean and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage or a heavily loaded filter, current spikes past the BMS protection threshold and the pack shuts output off temporarily. The BMS resets itself after a short cooldown, which is why the vacuum restarts without you doing anything. Clear any blockage, check the filter, and run again — if the cutout stops, the pack is fine. If it persists with a clean filter and clear nozzle, measure pack voltage at rest; it should read at least 16.0V on a full charge.