About one year ago I replaced the battery in my discovery. Nothing specific, just an autozone battery, low cost (duramax I think). It lasted about 6 months and died. Weird I thought, but just bad luck. Warranty swap at no cost and i'm running again. Now 6 months later and another dead battery. I remember talk about batteries somewhere that mentioned a low quality battery will last about that long. Is this a known issue? Should I suspect something other than just a cheap battery? I'm going out tomorrow to fix it, but was hoping to have a little better knowledge than what I have now.