The battery is an easy find most drugstores and good hardware stores will carry the alkaline version.
Be very careful when you open the battery door they tend to be easy to break on A-1's you will have to remove the action grip as the door is under neither it.
That Winder A will take regular AA's
How does the shutter sound? if you fire it at say 1/60th does it have a snappy sound or more of a weasing sound almost like a long sneeze?
Canon A series need to have the mirror dampener relubed about every 7-10 years and almost all of the ones you see now are way past due for a Clean Lube and Adjust service.
If you have an questions drop by the Canon FD forum on Photo.net I am one of the moderators there.
www.photo.net
http://www.photo.net/bboard/forum?topic_id=1546I have a rather extensive Canon FD collection I'm down to 11 bodies and 38 lenses. and a couple apple boxes of accessories.
be glad to help
By the way which 35mm lens did you get?
Speed? f3.5 f2.8 or f2.0 Chrome locking ring or chrome locking button front element concave or convex ?