Bob, I have battery tenders for all my toys. I have two batteries in the searay and one battery tender charges them both. If they are very low when you hook up the charger it make take a day or more to get the green light. When my son deployed to Bahrain in May, it took three or four days to get to the maintenance mode.
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This post is opinion based on experience.
2015 Hurricane 27K
2013 Sea Ray 220SD
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