Put a slow drain on battery until totally dead. Let is stand a day, hook up slow charger, 6 amp or less. If charger acts ok leave it on until all cells are gassing freely, may take a couple of days, and voltage is about 14 to 14.5 Check each cell with a hydrometer to see if they are close to same. Load test, if it fails, discharge it again, same procedure. If it fails load test, junk it. Batteries are strange animals. I had two this spring, rarely used ones, they both showed normal open ciruit voltage. The six volt showed 6.3 and 12 volts showed 12.6, hydrometer showed near full charge, and neither one had been charged for several months. Neither would even come close to passing the load test, 50 amp draw and they were down to 4 volts and 9 volts respectivly. After I discharged each and recharged they both passed load test of half of cold cranking capacity. How long they will last, I don't know, but have used the one more than a few times so far.
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