Or go to a battery specialty store where they can make a cable for you quickly.
I generally make them myself: crimp and solder the connectors (put shrink tube on the cables before the connectors, do not heat yet), slaver liquid tape over the bare soldered metal, now apply and heat the shrink tube. Yes, I am a little overboard on this, but water tends to get inside and makes the cable look ok even when there is internal corrosion (salt water is especially bad).
Do not forget about the ground/black cable.
Good luck and always have fun.