I've been shooting nonstop in Hong Kong for the last week with the D200. Picked up an MB-D200 and an extra pair of EN-EL3e's the 2nd day I was here. Figure it'd be nice to have some real shooting done to go with all the tests. I can get 400 uncompressed shots on a single EN-EL3e if I'm shooting with my manual focus gear. That's with image preview enabled. When I shoot with the 17-55, the numbers drop - in some cases almost in half. I'm guessing that the stronger AF motor is just killing the battery. That said, running an MB-D200 with a pair of batteries is more than enough to get through the entire day. If you don't have a pack then get a spare if it'll put your mind at ease.