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How good is my battery?
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<blockquote data-quote="sexy" data-source="post: 8035321" data-attributes="member: 612355"><p>14.4 is the standard output from the alternator for most cars on the road today. 13.8 is still pretty common also but 14.4 is the most common. Whether it’s a 14.4 or 13.8 alternator it has nothing much to do with how good your battery is. If you were to unhook the battery and check your cig lighter with the engine running of course it would still read 14.4.</p><p></p><p>Each cell in your battery produces 2.1 volts for a total of 12.6 when fully charged and resting. If your battery reads 12.6 or above that’s good but still does not tell you how good because there could be problems with internal resistance. As batteries age they start having more internal resistance and there are some simple test that you can do to tell how good your battery really is. If you ever want to test a battery to see how good it is then you need to Google battery resistance testing and do the work to find out for your self. Auto parts stores have testers that can do this test for you but I like to test my own to be sure.</p></blockquote><p></p>
[QUOTE="sexy, post: 8035321, member: 612355"] 14.4 is the standard output from the alternator for most cars on the road today. 13.8 is still pretty common also but 14.4 is the most common. Whether it’s a 14.4 or 13.8 alternator it has nothing much to do with how good your battery is. If you were to unhook the battery and check your cig lighter with the engine running of course it would still read 14.4. Each cell in your battery produces 2.1 volts for a total of 12.6 when fully charged and resting. If your battery reads 12.6 or above that’s good but still does not tell you how good because there could be problems with internal resistance. As batteries age they start having more internal resistance and there are some simple test that you can do to tell how good your battery really is. If you ever want to test a battery to see how good it is then you need to Google battery resistance testing and do the work to find out for your self. Auto parts stores have testers that can do this test for you but I like to test my own to be sure. [/QUOTE]
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How good is my battery?
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