CONCORDE Battery Tester. The BC-6000 is designed to accurately test and report on batteries ranging in capacity from 10AH - 55AH. Plugged into a a USB port, the BC-6000 will create test reports directly from your computer. Powered by the battery being tested - No AC power required. Constant current load adjustable in one ampere increments. 50 mv resolution. Includes an LCD display and over temperature protection. Audio alert when capacity test is complete.