Ensure your semi truck is Ready for the Road Ahead with ready-to-go batteries, with the Schumacher ProSeries 6/12/24V Battery Charger / Engine Starter. Thanks to its ability to rotate between a variety of amps and volts, this replacement charger is the ideal option to recharge low power or drained batteries. Fashioned with multi-stage charging standards for added precision, safety, and battery life. FleetPride is your First Click in Heavy Duty .