Thanks guys, wanted to troll for some information to educate myself better, and you happily obliged. Sounds to me between these posts and the PMs I received a 12V 7.5AH battery is what I need to continue using, and the prices on TH are fair. Guess I'll buy a few.
I do charge the batteries in the Fall and keep them in the basement, and charge again in the Spring. All my batteries are holding a full charge, but when I drop in the feeders they immediately drain again. Guess it's time to replace. TH here I come.