Mine I had coming from an un-switched supply at the roof electronics, I would leave it plugged in if I was somewhere I wanted it left on, and if I was removing it from the car or the car was safe I'd just pop the plug out the top, I left it plugged in for over 7 days solid and due to the **** battery management system I nearly ended up with a flat battery once, I recharged the battery and unplugged it during most nights when the car was safe and never had the problem again.
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