How big is the battery box? Measure it, and install whatever 12v battery that fits. Depending on the length of the cables, use either #4 or #2 cable. Bigger is always better where battery cables are concerned.

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!