Since I've picked up my Thinkpad, I really wonder why Lenovo doesn't stick in a small internal battery ontop of the removable (say good for like 10 minutes or something...) so that: a) On power loss (battery removed), it can still dump into hibernate (the real one) b) So you can hotswap the external batteries. I have two batteries, and when I'm out for long periods, it annoys me that I have to dump it into hibernate so I can swap batteries. It's just an extra few minutes that really annoy me.