Using GR8-1291

Remove the battery filler caps and check the water level. If necessary, add water to the appropriate level. Reinstall the caps.
Attach the small red clamp to the positive battery terminal and the small black clamp to the negative terminal.
Select the Battery Test icon in the Main Menu, then press the NEXT key.
Test the battery by following the on-screen instructions to enter the appropriate information. Refer to the Mazda GR8-1291 Instruction Manual for more information.
After the test, the Control Module displays the test results in a series of screens. The analysis includes the battery state of health (SOH) and state of charge (SOC). Before the Battery Test results are displayed, use the keypad on the Control Module to enter the last 5 digits of the vehicle's VIN and press NEXT to continue.

The Mazda GR8-1291 will print out the test results and display one of the eight possible results listed below. Review the results and follow the Action Step for the displayed result.

Battery tester display	Action step
GOOD BATTERY	Return the battery to service.
GOOD - RECHARGE	Fully charge the battery and return it to service.
CHARGE & RETEST	Fully charge the battery and retest. Failure to fully charge the battery before retesting may cause false readings. If CHARGE & RETEST appears again after you fully charge the battery, replace the battery.
REPLACE BATTERY	A REPLACE BATTERY result may also mean a poor connection between the battery and the vehicle. If you tested the battery using the System test, disconnect the battery cables and retest using the Battery Test before replacing it.
BAD CELL-REPLACE	Replace the battery. WARNING: Do not charge the battery. Charging a battery with one or more bad cells could cause an explosion and serious harm to the user.
SIDE POST TEST	Test data was inconclusive using the side post. Retest using side post adapters.
JUMP START POST	Data was inconclusive using the jump start post. Retest at the battery terminals.
24 VOLT BATTERY	24-volt battery detected. You are attempting to test both in-vehicle batteries in a 24-volt system. Disconnect the batteries and test them individually.