Abstract: The embodiment of the battery charging circuit disclosed herein employs a relay which can be operated both mechanically and electrically. Mechanical operation is achieved by a manually operable push button which when depressed closes a relay contact in series with the relay winding. Current then flows into the winding to actuate the relay and provide a current path for the fast charge of a battery. If the battery temperature is elevated above a level considered safe for recharging, fast charging of the battery cannot occur until the battery has cooled. If the push button is depressed while the battery temperature is so elevated, it still closes the relay contact but no current flows into the winding. However, the push button is maintained in a depressed position by engagement with the relay armature. Once the battery cools, the already closed relay contact permits current to flow into the winding to actuate the relay and initiate a fast charge.