It didn't seem like you'd gotten an answer. FWIW, I have two "Optimate4" battery maintainers...one which is on my 2008 RT whenever it's in my garage, and another which goes on Mrs. ExGMan's BMW 4-wheeler when it's left alone for three days or more. I connect each of these directly to the battery. The Optimate4 comes in a version which is CanBus Compatible, but if you're going to connect directly to the battery, that's a non-issue so you don't have to pay extra for that feature. Also, I have been using an Odyssey PC680 for a couple of years now. Seems to work just fine.
Last edited by ExGMan; 12-17-2013 at 03:46 AM.
2015 Ebony Metallic R1200RT
BMW CCA 2006 - Present; BMW MOA 2009-Present
Walt Kelly: "We have met the enemy, and he is us."