Patriot,
I have experienced the same thing. Many times mine will sit for a week w/o moving and this took its toll on my original battery plus my first optima. The optima was bad and replaced under warranty but just this past week, it started (barely) but it reset my clock to 12:00, the voltage was low.
It did this stuff before I added anything to it and has continued and is extremely intermittant. I do leave my Garmin GPS plugged in and on but that is the only thing and it doesn't draw enough to pull the battery down. This is one of the reasons I am going to do the dual-battery deal (one of these days).
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