- Visual check the battery for leak
- Check the acid level ( not always possible )
- Check that the connection are tight and the cable in good connection
- Check that there is no sulfate on the connection
- Check that the battery doesn't move on it.s support
- Check that the battery's case has no crack
A hydrometer can be used to test the specific gravity of each cell which give you an indication of the charge .
For the fonctional check you can use a load tester to see if the battery hold the charge and that the voltage is correct above 13.6 Volts.
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