Instead of switching from one battery to another can't you just leave it on the both position of the switch? What would be the benefit or determinant of using that position on the switch?
I'd say 80% of my fishing is trolling so I don't go long periods of time with the electronics on without the engine running so maybe I don't need a deep cycle so much as someone who drifts and anchors up. My switch is a little bit of a PIA to be always reaching for the change from one to another. If having a deep cycle and a starting battery is advantageous then that is what I will do. P.
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