Keep the Schumacher 100 amp Battery Charger in your vehicle so you are prepared for when it needs some help getting started. This charger is strong enough to start up large vehicles such as SUV's and trucks. The Schumacher electric battery charger has a digital display so it is easy to read, and a start/stop interface to make it easy to use. It is microprocessor controlled so it automatically adjusts the amperage rate to charge and maintain for a more efficient charge and to provide better battery life. This engine start battery charger will provide up to a three times faster charge than other chargers. It even has a built in battery tester and alternator tester so you can check your car's power whenever you need to.??