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I know this is not really what you are wanting to hear but........I like to keep the starting/running batteries separate and use deep cycle batteries for the trolling motor and install a 2 bank waterproof charger for them if you want. I have never been able to run my deep cycles down and treated them with MinnKota battery stabilizer and have been using'm since 2002. I have replaced the starting batteries once.
I always am comfortable that if something happened to the starting batteries (dual sepector set to "both" and accidentally ran down,etc), I could just take one of the separate deep cycles and start the motor....duplicity and redundancy out on the water just like having separate vhf's and gps's.
Just a thought, good luck, Molar
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