An electrical connector for a helmet-mounted night vision system including a receptacle assembly and a mating plug assembly. The receptacle assembly is configured to be mechanically coupled either directly or indirectly to a helmet and electrically coupled to a night vision device that is mounted to the helmet. The plug assembly is configured to be mechanically and electrically coupled to a battery pack. The plug assembly and the receptacle assembly are configured to be releasably mated together in at least two different orientations for releasably mounting the battery pack to the helmet and supplying power from the battery pack to a night vision device that is mounted to the helmet.