A circuit interrupting device for use with an electrical power distribution system includes a housing containing a circuit interrupting mechanism. A battery tube is positioned in the housing. A battery assembly is configured to be inserted into the battery tube. The battery assembly includes an assembly body having a first end and a second end and a battery is positioned within the assembly body. A cap is connected to the assembly body and configured to connect the battery assembly to the battery tube. The cap includes a torque-limiting device that prevents overtightening of the cap to the battery tube.