ADAPTER AND POWER TOOL SYSTEM

An adapter (100; 200; 300) comprises an input port (20; 80) being coupleable with a single-voltage output interface (10') of a single-voltage battery pack or a multi-voltage output interface (10") of a multi-voltage battery pack, an output port (30) electrically connected to the input port (20) and being coupleable with a single-voltage input interface (20') of a first power tool or a multi-voltage input interface (20", 30") of a second power tool, a switching mechanism (40; 60, 70; 90) being switchable between a first state and a second state. When the switching mechanism (40; 60, 70; 90) is in the first state, the input port (20; 80) is coupled with the single-voltage output interface (10') and the output port (30) is coupled with the multi-voltage input interface (20", 30") of the second power tool, when the switching mechanism (40; 60, 70; 90) is in the second state, the input port (20; 80) is coupled with the multi-voltage output interface (10") and the output port (30) is coupled with the single-voltage input interface (20') of the first power tool.