ELECTRIC POWER TOOL WITH TWO OR MORE BATTERY UNITS AND ELECTRIC POWER TOOL ARRANGEMENT COMPRISING SUCH AN ELECTRONIC POWER TOOL AND A VOLTAGE CONVERTER UNIT

The invention refers to an electric power tool (10) comprising a housing (12), an electric motor (34) located inside the housing (12), a working element (22) protruding from the housing (12), wherein the electric motor (34) is connected to the working element (22) in order to impose a rotational and/or an eccentric working movement (130, 132) to the working element (22), and two or more battery units (36, 44) adapted to provide electric energy to the electric motor (34) for its operation. It is suggested that one of the battery units is an external battery unit (36) provided separately from the rest of the electric power tool (10) and releasably attachable and electrically connectable to the rest of the electric power tool (10), and the at least one other battery unit is an internal battery unit (44) fixedly located inside the housing (38) and electrically connected to the rest of the electric power tool (10).