The Schumacher Electric BT453 135A Compact Battery Load Tester is designed to test 6V and 12V conventional and maintenance-free batteries up to 1,000 cranking amps. It can also do a 135A load test. The 12V Charging System Analyzer tests the battery’s state of charge, battery’s cranking ability, charging system’s output, and the starter system. The BT453 is portable and completes a test in less than 10 seconds, the company says. Additionally, it offers an easy-to-read meter, top-mounted rocker switch for easy operation, and heavy duty color-coded battery clamps.