The battery in my truck always runs out because I don't use it that often so I have to remember to go out and run it once a week. I put it in the window and plugged it into a 12v outlet. The car sat for 3 weeks and started immediately. I put a meter on it and it's ready for 19V when the sun comes out. That's cool. I wish it had a smart charger to turn it off, but I'm blown away. I'll get one for each boat too.
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