Only having one bike does tend to minimize my choices.......
Two weeks in a warm garage seems kind of short. Is it an old battery or has it always been like that?. I think if you put a volt meter between the battery and the ground you can see if you've got a slow drain, then it's just a case of cleaning connections and switches till it's gone.
Between kids, house chores and winter setting in, commuting to work is about 99% of my riding now it's getting dark by 4:30, on my days off it's invariably raining like hell.