XBT779 Euro Pro SV780 Stick Vacuum Replacement Battery 18V 3000mAh

Euro Pro SV780 / Pet Perfect II — 18V Ni-MH Replacement Battery (XBT779)

This is an 18V 3000mAh Ni-MH replacement battery for the Euro Pro SV780, VX33, Pet Perfect II Hand Vac, and Shark SV780 cordless stick vacuums. It replaces OEM part XBT779 and fits the same battery bay without modification. Capacity is sourced from the product specification — 3000mAh, 54Wh.

• SV780, VX33, and Pet Perfect II compatibility: These models share the same 18V battery platform, connector pinout, and BMS handshake. One cell pack covers all of them — no adapter or wiring change needed.
• Bench tested on actual hardware: We cycled this pack through repeated motor-start loads on the SV780. The BMS held voltage under sustained suction draws and recovered cleanly after overcurrent events caused by filter restriction.
• Dock charging habit on the SV780: Remove the vacuum from the charging dock once the pack reaches full charge. The SV780 dock does not interrupt trickle current automatically, and Ni-MH cells left on continuous charge develop accelerated capacity fade within weeks.

Suction dropping before the battery indicator reaches low on the SV780

This happens when the motor is drawing more current than the cell pack can sustain at rated voltage — typically caused by a partially blocked filter, not a failed battery. A restricted airflow path forces the motor to work harder, pulling current spikes that drag cell voltage below the BMS cutoff threshold. The vacuum appears to be running out of charge when the actual problem is load-induced voltage sag. Clean or replace the filter first, then retest under normal load.

Motor cutting out mid-use and recovering after a short pause

This is a BMS overcurrent trip, not a failing battery. When suction is restricted — blocked nozzle, clogged filter, or hair wrap on the brush roll — the motor draws sustained high current and the BMS shuts the pack down to protect the cells. The brief pause allows the BMS to reset, which is why the vacuum comes back on. Clear the blockage, verify the filter is clean, and confirm cell voltage sits above 15V at rest before resuming use.