The ATD Tools Battery Charging and Starting System Diagnostic Tester, No. ATD-5494, is designed to test all 12V lead-acid batteries, including AGM and gel. It detects and alerts bad cells and surface charge, and has a 100-1,700 CCA range. The tester also has a 5V to 33V operating range, 12V starter test with cranking voltage, 12V charging test with load and ripple test, and 24V starting and charging test in voltmeter mode. Additionally, the tool displays the battery capacity percent and a color-coded bar graph.