Just read this from another forum
dated FEB2012
home office of Interstate Battery.
The battery part number that replaces the U2200 is “GC2-XHD”.
The reason for the change in the part number is that Interstate Battery changed the company that makes our golf cart batteries for us. Our golf cart batteries are now made by another battery manufacturer which makes golf cart batteries that (according to extensive testing) have an even higher level of quality and useful life.
Cordially,
Dan Lane
Interstate Battery Customer Service
Dallas, Texas
Sure hope COSTCO still carries the 6V Golf Cart Batteries... Was going to try get some this season...
Roy Ken