Battery, Testing Maintenance-free batteries must not be opened. Otherwise, the warranty is void. > Battery, Testing with Midtronics Battery/Starting/Charging System Analyzer MCR340A > Battery - Vehicles with Energy Management Control Module, Testing with Vehicle Diagnosis, Testing and Information System VAS 5051B > Battery No-Load Voltage - Vehicles without Energy Management Control Module, Checking > Battery No-Load Voltage - Vehicles with Energy Management Control Module, Checking > Battery, Load Testing with Midtronics Diagnostic Conductance Charging Station INC-940