Quote Originally Posted by Dobe Mejuwa View Post
Yes, Neg of one battery and pos of other. In this connection of parallel batteries the combined amp hour out put us doubled so charging time will about double. Fyi Google "charge parallel batteries with one charger" and you get several good videos and link to "Battery Genius" page that explains better this this old snook can 
Good post. I suppose I need to change my ways too. Which begs the question . . . if only connecting the charger to one battery lengthens the charging time, is the discharge time affected by how, for example, the trolling motor is connected? I have it connected to one battery and assume it is just as efficient as connecting to both.