Actually: several questions!
I've got a pair of 12 volt, Group 27 batteries hidden under the stairs.
I've a one Battery Tender Junior, that's left over from my motorcycles.
1. Should I hook that up to just one of the batteries, and let the fact that they're hooked together take care of the other one, or just hook to the ground and one battery, and the hot lead on the other?
2. Is 750 mill-amps enough, or should I just pop for a stouter 'Tender?
3. Will this also take care of the chassis battery at the same time, or should I get a second one for up front?