Has anyone had experience with any of these chargers? See
CTEK Battery Chargers | The World's Smarter Battery Charger
for the full line of models. I bought the Multi US 7002. I've been reading the documentation and haven't connected it yet. My Interstate will be in long term (indoor, heated) storage in Oregon this winter and I think I will use this one for the coach batteries and perhaps get the cheaper Multi US 3300 for the Sprinter battery. The FAQ page says you don't need to disconnect the battery when charging with these models but I'm wary. Any thoughts from the forum would be appreciated. For those that have their vehicles in long term storage during the off season, what do you do to keep the batteries up?