I've got Battery Tenders on everything. Are they trickle chargers or floating?
ORIGINAL: 09Chllngrlvr
I would recommend connecting a float charger if you are going to store your vehicles for a long time (>1 month). Just make sure it is a float charger and not a trickle charger as those will cook your batteries for sure. I've got Harbor Freight float chargers on all my batteries in storage. This includes everything from lawn mowers to a boat and "good weather" cars. Never had a dead battery since they where installed.