If I have limited space and wanted to have a solution in case I run down my starting battery (runs all accessories too except TM), would it be better to use a ~20ah (prob 250-300cca) PWC battery on a battery bank switch, ORRRR would it be better to just carry a Noco portable jump box in the boat to jump the starting battery if it ever gets too run down to start the motor? This is on a 50hp outboard.
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