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Best solution for me on my ‘93 Montauk 17 (2 x battery) is to use these solar panel trickle chargers. Bought 2 from Amazon and they work great. They also are “smart” so they won’t over charge the battery. I’ve been using them for 3 seasons now. Leave them connected when not using the boat. I even leave them connected all off season and the motor fires right up in the spring. I do have one new battery which is a year old and one that came with the boat so it’s at least 6 years old. The trickle charger still keeps a good charge on it and it can still start the motor no problem.

https://www.amazon.com/Upgraded-Water...NrPXRydWU=