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Had the same thing happen with a two year-old Optima this Summer. Every other week, it seemed to drop to 4 volts or slightly less. Took 12 hours or more to recharge it to 6.3 volt output. So, this past weekend after I had recharged it to 6.3 output, I put it on a battery load tester. In five seconds under load it went from "OK" to the very low side of "Weak." I traded it in for a 6 volt, group one wet cell this weekend for a net price of $64 (after $12 trade-in credit).