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One test I always do is with a volt meter pop the fill caps on battery and starting at one side put one lead on bat. Post and the other in the water in first cell. Write down what you get continuing to next cell etc. Till you touch opposite post. Then start at that post and go the other way. You should got a similar reading from cell to cell. If you were to get the same reading the next cell ie.2 4 4 6 8 10 you probably have a dead cell. Granted its going to be 1.8 1.6 etc. Not exactly the same bit close within .5 of a volt. Been working on automotive and heavy equipment for 40+ years and it's helped me. Good Luck
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