You need to make sure its an NHRA approved battery box, NOT MARINE BOXES. You can get away with a marine box that they sell at Wal-Mart but once you go to a track unlike Rock Falls or Cedar Falls, and if you start running sub 12s they get anal. The only approved box I know of is the Moroso. It is this one:
MOROSO BATTERY
I just searched google so I don't know if it is cheaper, that is the first site that popped up.