Our batteries are a group 94r. The thing about finding a battery for our jeeps are that the posts are reversed than a standard battery. Like where the normal battery has the positive on the right, ours have the positive on the left.
The best standard battery used to be duralast.
If you need a new battery get a group 49 battery instead of the 94r that is from the factory. The group 49 has around 1000 cca's as apposed to the 94 that has around 700 cca's. Also the our battery, the 94r is about $150 in any auto parts place with a decent warranty and the group 49 is less than $100 with a good warranty.
The group 49 is a little wider so it will be a tighter fit but it will fit.