While it's at the dealer have them install an onboard battery charger too. During the season we use the boat enough to keep the batteries charged up. In the off season we just plug the charger in to keep both batteries charged and maintained without having to remove them from the boat.
Too late, took delivery today so we could be on the water this weekend, lol...
I'll look into self installing something like this:
ACRs share charging current for all of a boat’s batteries and protect the starting battery from discharge.
seems like an affordable/smart solution. Since i'm in storage away from home, i won't have much control to charge things anyway. I'll have to ask the dealer what they do from a battery standpoint. guessing they just winterize, disconnect battery, and shrink wrap it