6v batteries from Costco (or somewhere else)

Costco has served me well. Call the auto center and verify they are in stock before you roll.

X2 on the DURACELL 6V GC2 batteries. I just got four of them from local BATTERIES PLUS BULBS store for around $85 each. This was the SLIGC110 model which are 215AH Deep Cycle Golf Cart Batteries... I was able to give them 12VDC battery cases for the core charges...

The other good deal thing here is you don't have to belong to any store like COSTCO or SAM's CLUB...

Roy Ken

Another option if a costco isn't convenient is to check for a local Batteries and bulbs, they sell the Duracell brand units and if they dont have what you want in stock can have it there in a day or two.

Your best bargain in a quality battery is probably going to be from a golf cart dealer. They buy and use lots of them every year, so getting fresh quality batteries is a lot better chance that other mass marketers.