The LEDs are not enough to cause the issue described. Also they will not draw power when the car is off and everything else is off and closed. They don't require are much power because that is the nature of a LED, not because the have constant power before they are turned on.
What you are describing sounds more like your battery is at the end of its lifespan and/or is not getting charged correctly.
With they said, I am on my 2nd Optima yellow top and love it. I am running my stereo system on it with a 250A fused with 2ga power cables.
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