It depends on the fish finder you have the larger screens eat up the battery and it means 12v and a minimum of 10AH for just the fish finder. A separate battery for the bait tank, usually 6v is better so the pump runs slower and do not make the bait have to swim too much against the flow.
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MARK ......... 2016 MALIBU X FACTOR, 2020 SOLO SKIFF (Fishing Kayak on Steroids  )
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