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Brent,
I am not sure about the new MSD boxes, but on my Jacob's Pro Street, the second I turn the ignition on, the unit stores enough juice for 35 plug firings in a buffer. However I am sure that if the battery were low enough that would start to affect the performance. About 5 years ago I bought one of the little battery tenders from NAPA for $39.95 I think it was and have never had a battery problem. So if your car sits for long periods, this might be something you could think about. They can be mounted right in the car if you want and just plug in an extension cord when you park. I have them on both of my cars and love them as I don't have to worry about the battery during the long Winter breaks.
Ron
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