I have had numerous Optima batteries go bad after being run down. Optimas seem to be notorious for going to shat after being discharged. Make sure your Optima is still under warranty, then take it back to where you bought it, demand a replacement if it is warrantied. Keep in mind, Auto Zone recharged mine and said it was fine the first time it happened to me, but the battery would not hold it's charge. That is why I was able to get a replacement at the time - back then Optimas had 5 year warranties though. Why would they lessen the warranty? Hmm...