Something on my Christmas list is an Engine Starter/Battery Charger. I plan to use it for a number of things including putting it in the console of my 19 foot Boston Whaler (w/4 stroke motor) when I go boating. <br /><br />Is this a good alternative to having dual batteries? I only run a VHF, fuel flow meter and GPS while boating, and feel I don't need two batteries. The unit I am looking at weighs less than 9-lbs and has lots of amps for starting. Any comments will be appreciated.