I'm not sure if its just me or the camera is just supposed to work this way. Using either the battery grip or the small puny battery, I can only get about 4-5 rolls before the battery warning flashes, and about the 9th-10th roll the camera will shut down. Totally. Could it be because of the lenses? Like the old 70-200/4? With the kit lenses I remember it could go for much longer!