I had the first battery stuck, just last night on an A1255. Brand new Duracells.
I tried everything, long screwdriver push against spring, rubber hammer.
So, as some have said, I did the following.
1. Remove the other two batteries. Easy.
2. Spray in some WD-40, not too much. Let rest upright.
3. Using an air spray electronics cleaner, I flushed it (messy).
Lo and behold, the stuck battery came out. Now drying on the radiator.
Now, If someone could help me figure out why the "1" and "3" keys don't work, I'd be grateful.
WP