I'd disconnect and put it on a trickle charger. It will slowly discharge even when disconnected. Letting a battery go dead is not good for it. It can also freeze when dead (not sure where you are we are in the NE) which will also kill it.
Some will leave it plugged in all. The time but that depends on your charger so as not to cook the battery.
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Pat, Jen & Heather... Oh yeah and our trained attack trailer cat, Cinnamon
2015 ChevyHD D-Max
2014 Greywolf 26DBH