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Sweet dude! I left my battery indicator on for a few days on purpose just to see what it would drain. The hole unit lost .3 in 3 days just sitting. When I've sat out all day, with lights on and charging my phone, I haven't even lost half a volt.... But Alaska days are mighty short, about 7 hours at the most.
I made a metal bracket that I plasti dipped to hold the batteries in place.