Battery recommendation - 74 Duster

I have put a new MOPAR battery in both my 66 Barracuda and the 74 Scamp that I purchased from my local Chrysler dealer. They weren't that expensive, the one in the Barracuda has been in there for at least 5 years and the Scamp for about 2 years and I have never had to charge them or have had any problems with them at all.
Bob