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Thats it rick, i even talked to cobra and they say i can use the deep cycle batteries from my boat but i picked up a cpl lawn tractor batteries there so much lighter lol

For the 24 volt external power youd just hook 2 12v batteries together i do series (1 pos 1 neg terminal wired together) leaving 1 neg 1 pos free then run wire from those terminals to pos neg post on...