Schumacher's Charger/Starter/Tester, No. SC-10030A, is a fully automatic charger, for charging and maintaining 6V standard and 12V standard, AGM and gel cell batteries. The 100A engine starter is powerful enough for starting SUVs, trucks and large batteries. In addition, battery and alternator testers provide charge levels and help diagnose electrical problems. LED indicators, digital display and button controls make this charger easy to use, according to the company.