Hello George Marsh, Battery testing does take a special tester. The tester has to have the capacity to load the battery. The battery, after is FULLY CHARGED, is loaded at 1/2 its rated CCA. SO..............you need a tester capable to do that.A voltage reading on a battery without a temperature stated is not very accurate.Your 700 CCA battery will produce only 595 CCA when FULLY CHARGED @32 degrees F.The same battery (700 CCA) will produce 455 CCA.@ 0 degrees F.Cold Crancking Rating is the capability of a battery to crank an engine while maintaining a terminal voltag of 7.2V or 1.2 Volts per cell.When a battery fails the above testing standards,like a worn tire...........replace it.
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