About six months ago, we bought a 2012 Searay 260 Sundeck with double battery option. We're seasonal south florida people, sometimes go up to 2 months without being down there. Boat is kept on a lift. My dealer is suggesting they install an on board battery charger. I note that was a factory option so it must be fairly popular. Haven't talked price yet so can't supply that. My boat is 6 months old and I haven't had an issue with dead batteries yet, but I know that will happen as it gets older. So, looking for pros/cons vs simply plugging in an extension cord to recharge the batteries vs buying a portable charger and setting it up when needed. Any thoughts, advice? No doubt a portable charger will be significantly cheaper so I suppose I'm asking more about the positives of having it installed on board. I'm confident the negative will be price/cost.