Abstract: A portable jump starter/charger combination includes a housing and a jump starter battery enclosed within the housing for providing a first DC output. A battery charger is also enclosed within the housing and provides a second DC output. A function selector switch has a first input coupled to the first DC output of the jump starter battery, a second input coupled to the second DC output of the charger and an output coupled to battery cables. The function selector switch is operative to selectively connect one of the first and second inputs to the output of the function selector for either jump starting a vehicle with a dead battery or charging the dead battery through the pair of battery cables.