The invention relates to vacuum system (1) comprising a vacuum cleaner (10) comprising a first housing (11) comprising an air inlet (12), an air outlet (13), a motor fan unit (14) for creating an airflow (F) from the air inlet (12) to the air outlet (13), a battery (15) for powering the motor fan unit (14), and a first unit (16) for charging the battery (15), and a charger (20) comprising a secondhousing (21) comprising a second unit (26) for changing the battery (15), wherein the first unit (16) is connected to the battery (15) and the second unit (26) is adapted to be connected to an external power source (22), and the first unit (16) and the second unit (26) are adapted for wireless power transfer from the second unit (26) to the first unit (16).