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Do a load test like mentioned, if it is weak junk it. Don't scew around with them they will crap out just when you need the friggin thing.
I just replace mine this summer and bought the newer AGM battery after reading a lot about batteries. So far they seem great but time will tell. They can take a pounding are sealed can be mounted in nearly any position and even work submerged (I have not check that claim)
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