Abstract: A battery-connection system for a battery having a pair of battery terminals of opposite polarity and positionable in either of two reversed positionings relative to distribution means. The distribution means includes a pair of spaced electrical terminals of particular and opposite polarity electrically connected with a unit to be powered. A carrier interpositioned between the battery and distribution means including a first pair of electrical contacts in singularly-polarized electrical contacting engagement with the respective battery terminals and a second pair of spaced electrical contacts electrically connected with respective ones of the first pair of contacts for singularly-polarized electrical contacting engagement with the respective pair of distribution means terminals. Each contact of the carrier second pair is of opposite polarity to the other, and comprises a set of plural alternate contacts of the same polarity.