The new self-sufficient lifters VacuBoyAkku work power-independant on the highest safety level. Equipped with a 24V pump and exchangeable battery with charger they work on the same principle as mains-operated lifters. They are equipped with a safety tank and an acoustic warning unit which equalize a possible vacuum loss or set off an alarm. The self-sufficient power-supply allows to use these devices at different work stations or on construction sites where they can be equipped with a two-circuit system based on the DIN EN 13155 regulations. On request a second battery can be supplied.