I dodged a bullet when a Powerex AA battery became lodged in my SD 302 and I was able to extract it. For a reason unknown to me, it had become swollen and wasn't coming out. I tried using a pencil-size magnet but no luck. Wig tape on a pen, no luck. Liquid nails on a dowel, no luck.
In a desperation move I drilled into the battery and screwed in a 4 inch deck screw. I got it out, but it left a lot of residue in the tube. Using another tool for grabbing dropped nuts and bolts (did I say I have fat fingers?), I grabbed a cotton ball soaked in alcohol, and rammed it in and out until it was clean.
All's good. I wouldn't reccomend this repair, unless you're a desperate as I was.