Abstract: An electric power tool (10), in particular a handheld power tool, including a motor (40) and a tool fitting (14) for holding a tool, for example a drilling tool, a cutting tool, and/or a grinding tool, wherein the motor (40) is configured to drive the tool fitting (14). The power tool (10) is remote-controllable. It can have a protection device (42) which is activatable and/or deactivatable by remote control. A system (200) consisting of such a power tool (10) and a construction robot (210) is also provided. The power tool (10) can be used particularly universally and simply, in particular both manually and in an automated fashion by the construction robot (210).

Abstract: A holding frame (22) for receiving a tool (24) which has a storage battery interface (58) for receiving a storage battery (60) such that the latter is detachable, in particular detachable without the use of tools. The holding frame (22) has a holding portion (70) that is designed complementarily to the storage battery interface (58). The holding frame (22) furthermore has an attachment point (80) for attachment to a manipulator (18) of a construction robot (10). A construction robot (10) is also provided. The invention inexpensively allows particularly versatile use of the construction robot (10).

Abstract: A construction robot (10), in particular for performance of building construction work, including a manipulator (18), a changeover interface (21) arranged on the manipulator (18) and configured for releasable arrangement of at least one element, in particular a tool (24) and/or a component to be processed, on the manipulator (18). A test device (104) which is configured for quality testing of the changeover interface (21), safety risks on use of the construction robot (10) can be minimized.

Abstract: An adapter for releasably connecting a power tool to a rechargeable battery, and a first and a second interface, a first set of control electronics and a second set of control electronics and a switching element for reversibly setting the second control electronics to an activation mode or deactivation mode, wherein in the activation mode at least a first transistor can be driven such that electrical energy can pass from the rechargeable battery to the power tool. A system with the power tool and adapter and a method for open-loop and closed-loop control of an adapter are also provided.

Abstract: An adapter for releasably connecting a power tool to a rechargeable battery, and a first and a second interface, a first set of control electronics and a second set of control electronics and a switching element for reversibly setting the second control electronics to an activation mode or deactivation mode, wherein in the activation mode at least a first transistor can be driven such that electrical energy can pass from the rechargeable battery to the power tool. A system with the power tool and adapter and a method for open-loop and closed-loop control of an adapter are also provided.

Abstract: Rechargeable battery, in particular for supplying a machine tool with electrical power, comprising a housing for accommodating at least one energy storage cell, and a positive line and a negative line for connecting the at least one energy storage cell to an interface device. The rechargeable battery contains at least one overcurrent protection device in the positive line or in the negative line.

Abstract: Protective apparatus for protecting a rechargeable battery pack including at least one rechargeable battery cell against an overvoltage in at least one line of the rechargeable battery pack. Method for protecting a rechargeable battery pack against an overvoltage, wherein the rechargeable battery pack includes at least one rechargeable battery cell and also a protective apparatus including a fuse device including at least one fuse, a short-circuiting line for optionally short-circuiting the at least one rechargeable battery cell by way of the at least one fuse, a monitoring device including at least one voltage comparator and at least one switch for optionally closing the short-circuiting line.