Guilty as charged, I throw away my batteries. I'm just too lazy to do the right thing. I had a teacher once complain that he had a stack of batteries on his desk he just didn't know what to do with.
But I don't throw away many anymore. I started using rechargeable batteries because of laziness. Why is everything I do because of that? I had a camera that ate batteries like no other. I didn't know what to do because if the battery was half dead, it didn't work anymore. I tried to use batteries until the very last drop, my mp3 player still liked them. But I finally caved and bought some rechargeable ones. I will never look back. I suggest you do the same.