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How do you know if a battery is bad?

Most batteries that are “bad” test as such on all three tests, but nearly a third of them pass one, or even two of these tests. No single one of the tests catches every bad battery, although of the three, the capacitance test is the best single predictor, in my experience.

What happens if a battery test is bad?

If the battery tests bad by either criterion, it’s bad, period (see “Selecting a Replacement Battery” on pages 32 and 33). What we and our customers all want, of course, is to avoid their becoming stranded by a foreseeable battery failure. Beyond a simple no-start problem, a bad battery may also shorten generator or starter life.

What does 'battery OK' mean in a battery test?

This applies in particular to test devices with which conductivity measurement is not possible, or battery testers in which no suitable test algorithm is implemented for new battery technologies such as AGM or EFB. The indication “Battery OK” then apparently shows that the battery is in a good state of health.

Is a fully charged battery better than a discharged battery?

A shortcoming is that an evenly discharged battery will test low until properly recharged, while a fully charged battery will test good regardless of its actual storage capacity. Furthermore, freshly recharged batteries may show a “surface charge,” skewing the results upward.

Does a green eye mean a battery is good?

A green eye does not mean the battery is good. Load testing with a variable carbonpile load provides a greater degree of functional certainty. In this test, a load equal to half the CCA rating is applied to the already fully charged battery for 15 seconds while the voltage across the two terminals is measured with a DMM.

How difficult is it to test a start-stop battery?

Interpretation of the test results for a Start-Stop battery is more difficult than with conventional starter batteries. This applies in particular to test devices with which conductivity measurement is not possible, or battery testers in which no suitable test algorithm is implemented for new battery technologies such as AGM or EFB.

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