Abstract: A rechargeable battery, in particular as a removable energy supply for a power tool, comprising at least one energy storage element and a battery housing with a cover element, four side walls and a base element. A first and second protrusion are arranged on at least the base element, wherein each protrusion has at least two sloping surfaces adjoining and opposite one another, and each arranged at an angle of 90° to 120°, preferably 105°, to one another, or each protrusion is configured substantially conical, wherein each conical protrusion has an opening angle of 90° to 120°, preferably 105°.