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<blockquote data-quote="sexy" data-source="post: 7683193" data-attributes="member: 612355">I would not let autozone test anything they are morons. You can test the internal resistance of your batteries yourself better than the guys at an auto parts store using a load a dmm and some simple math. Google the subject to get the math but what I do is set a battery on my workbench hook jumper cables up to it and a car with no battery then measure that starting/resting voltage then apply car headlights for ten minutes and check voltage. Do the simple math and you have the actual internal resistance which is way better than any auto parts store test.All batteries in a bank should be the same exact batteries purchased on the same day for best results.Some flooded cell batteries are twice as powerful as some absorbed glass mat batteries and vice versa.For testing alternators always make sure the test is done with an alternator that is hot from use never test a cold alternator because they may test good when they are actually bad.</blockquote>

[QUOTE="sexy, post: 7683193, member: 612355"] I would not let autozone test anything they are morons. You can test the internal resistance of your batteries yourself better than the guys at an auto parts store using a load a dmm and some simple math. Google the subject to get the math but what I do is set a battery on my workbench hook jumper cables up to it and a car with no battery then measure that starting/resting voltage then apply car headlights for ten minutes and check voltage. Do the simple math and you have the actual internal resistance which is way better than any auto parts store test. All batteries in a bank should be the same exact batteries purchased on the same day for best results. Some flooded cell batteries are twice as powerful as some absorbed glass mat batteries and vice versa. For testing alternators always make sure the test is done with an alternator that is hot from use never test a cold alternator because they may test good when they are actually bad. [/QUOTE]

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