[tom_in_orl]

I have basically the same setup except a 2 stroke. I have been using a single AGM Group 27 for 18 months now. The only reason I would consider two batteries is if my motor didn't have a pull start for backup. Does the 4 stroke come with pull start?

 

[tom_in_orl]

That should work. I don't have personal experience trying it but a motorcycle battery can crank big v-twins so a 25 hp boat motor should be no problem. Also consider a battery switch so you can move back and forth in case one dies.

West Marine Battery Switch