As for the difference between BA100 and BA101 Vehicle Battery Analyzer, there are several points: Increasing function For BA101 Vehicle Battery Analyzer: BA101 increases cranking system test and charging system test. BA101 increases EFB battery. BA101 increases quick test function. BA101 increases auto-storage function. BA101 increases Print function via computer. The advantage for BA101Vehicle Battery Analyzer: Four button for operation, more convenient for client. Bigger display, more information. as below picture: BA101 can shows the testing result in one screen, but BA100 Vehicle Battery Analyzer only show one or two items in one screen. so that BA100 must need five displays to show all information.