US Patent 8169298 Electric hand tool device and battery pack therefor

The invention relates to a battery-operated electric hand tool device (2) comprising control electronics (14), a wirelessly and contactlessly responding transceiver (12), and a storage unit (16) in which an authorization code is stored, a locked mode of operation and a released mode of operation being distinguishable. In order to improve theft protection, a wire-bound or wireless interface (22) is provided from the control electronics (14) of the electric hand tool device to a battery pack (4) such that locking data can be transmitted from the control electronics (14) of the electric hand tool device (2) to the battery pack (4), be stored in a storage device (24) of the battery pack (4), and be read out of the storage device (24) again.