Abstract: Control method for a rechargeable battery that has an interface for communicating with a handheld power tool and for supplying power to the handheld power tool, wherein a machine characteristic value characterizing the handheld power tool is received via the interface of the rechargeable battery, the machine characteristic value representing at least one physical property of the handheld power tool, and the rechargeable battery being activated to deliver electrical energy to the handheld power tool if a logic circuit of the rechargeable battery determines that a system characteristic value, which is based on the machine characteristic value and on a rechargeable battery characteristic value representing a physical property of the rechargeable battery, exceeds or falls short of a predefined safety threshold.

Abstract: An energy supply device, in particular for a power tool, wherein the energy supply device includes at least one cell and wherein at least one cell of the energy supply device has no pressure relief valve. Moreover, the at least one cell can have a flexible outer shell, at least in some section or sections or some region or regions. The at least one cell can have an outer surface or a volume, wherein a size of the outer surface or of the volume can be changed in accordance with cell parameters. In a second aspect, the invention relates to a power tool having a proposed energy supply device.

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.