I have 2 Interstate Megatons in mine. I think they were about $80-90 bucks each at the Interstate store. 750cca, good reserve capapcity, no gripes after 3 years and a lot of abuse, lot of bleeding air, hard starting, once i even left the lights on throughout the church service and it still fired right up after that. The Cat gel cells 1000CCA area lso supposed to be good. The Wal-Mart ones are fine and as was mentioend, good warranty. I don't know see teh Optimas being worth the extra bank.