I was having some serious battery drain problems and, after checking the MobileDock Battery Saving Mode in the Settings menu, I reached the conclusion that the problem lay with my keyboard. So I called ASUS and they were actually very helpful and told me that there was a faulty chip in my keyboard as well as many other keyboard docks for the Eee Pad Transformer. Turns out they fix these things for free, so I sent my keyboard in under warrantee and got a new one back. No more battery problems, hooray!
Just wanted to let you all know to check this if you're having battery probs.