You should be using a battery tender with auto shut-off. I just put mine away and just disconnected at the posts. Due to the dreaded "parasitic drain" on these cars the battery will go dead (mine froze solid and cracked last year) in a few weeks.
If I was you, I would just remove the battery. You may have to charge it before you put it back in, but I think you will be better off doing it this way. I would'nt want any kind of charger hooked to my car for a long period of time, I can't imagine that would be safe, but thats just me.