I pulled the batteries and have them stored in a closet indoors. Any need for a battery tender, or can I just assume they will need time to charge before next use?
Get an automatic battery tender. It will go into float mode once the batteries are up to charge. It will periodically check and top them off. I have them on my trailer battery, my Excursion, snowmobile and lawnmower.
And yes, pull them from the closet and keep them in the open.