Originally Posted by WrongWayRandall
A Battery Tender Jr. is like $35 from most sources - I'd go that route and just keep the battery in the garage. That way it's at %100 and ready to go when things thaw out outdoors and the battery lasts longer.
IMO, it depends on the camper and how much of a PITA it is to get to the battery. On my fifth wheel, I have to move stuff in the storage to get to the under-the-floor- battery compartment. Then I have to remove 2-3 screws. Before I got wing nuts for the battery terminals, I had to have tools to remove the battery. And then, since it's in a storage hatch, under the floor- lifting it up and out was an unpleasant experience. With the battery disconnect, it's reach in, turn key and remove.
Different strokes for different folks.