Clore changed their charging circuitry some time ago to prevent damage if it's left plugged in full time. That said, you really don't need to keep it plugged in. 24-48 hours every month or so should be plenty.Just yesterday I went to start one of my lesser used trucks and the battery was dead. I had to charge it over night to get it to start because I couldn't get at it with another truck to jump it. This made me consider buying a jump pack, but I will very, very rarely use it. So, lets say I find a good deal on eBay or Amazon on one, but don't end up using it until next summer or something. Will leaving it plugged in all day, every day for months at a time ruin it like other battery powered items?