Welding cable is made up of hundreds of strands of hair-fine wire, which will carry current much more efficiently than the relatively coarse strands of a battery cable. I've had very good luck using #1 or #0 welder cable for battery leads, and soldering the terminals on to minimize voltage drop.
Jerry

"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!