Just plug it in and it should charge. If you store it in the winter (I have to keep mine in a storage facility) take out the batteries and keep them at home on a trickle charger. It's not good for the batteries to run down and freeze.
On an unrelated note if you ever get time check out the Air Midwest group. We just got back from our first AS rally in Branson and it was a blast! Lots of great people (with lots of AS knowledge) and some very cool trailers.
I just plugged it in.. Ha
I bought two new batteries before we headed to Utah, while I was there (batteries plus) I went ahead and bought a trickle charger. Not ready to winterize yet.
Sorry we missed the Branson meet. Maybe next year. My folks live down there (Shell Knob area) they'd never allow us to come down and not stay with them.