For those 12 volt battery experts out there....I recently purchased a B37 with fairly new AGM batteries-both house and starting-my first experience with AGMs. In my prior boats with flooded batteries I kept the charger on 24/7 year around which served me well in terms of batteruy life. Is that advisable with AGM's? The boat has a 3 stage Xantrex charger set on the AGM voltage. Thanks.