4. Servicing Equipment Requirements
In order to accurately and quickly check the condition of maintenance-free batteries, you should have available a digital volt meter capable of reading to 0.01V and a battery tester utilizing load cells (VAT 40, or equivalent) or electronic testing (Midtronics PowerSensor Plus).^ A VAT 40 requires the battery being tested, first be charged to 12V or higher.
^ The Midtronics tester requires 10.2V or higher to test and provides an indicator lamp confirming that the battery is OK to test. See Special Tool Bulletin Cat. ST, No. (003/95 revision 8/22/95) for Midtronics purchase information.