I want to add a second battery in my boat just so I will always have a backup battery to start the boat if we decide to just hang out and listen to music or fill sacs without the boat running. My question is, does it matter how far away the second battery is? The way my boat is set up I would like to put the battery about 7'-8' from the perko and other battery. Will this work or do I need them to be right next to each other. Thanks in advance.
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