What I do is charge it with my 3 stage car charger until it says full. Then plug in the converter and float charge for about 3 days before camping. That extra charge from the converter seems to give me another couple of days of battery power. I don't believe that the "smart chargers" ever fully charge the batteries. My Magnetec will float at 13.2 v. When you return home or to a FHU campsite recharge with the car charger. Alternator driving does very little to recharge compared to the 40 amp car charger.
