JAC0348-R 48V, 3A Schauer Battery Charger/Maintainer for 48 Volt Systems up to 40 Amp Hour Battery Capacity, with Ring Terminals

What's the difference between this and the jac0348man?

My chart has 7 6 volt batteries I think I need a 42 volt maintainer and do you make one I could buy

I have 4- 12 volt 12 ah batteries I use for a handicap scooter. I want to maintain a charge in the winter so the batteries dont die out. Is this good

how to hook up on golf cart ?