This morning I started a test: Made sure my DINC was charged to 100% Turned on airplane mode Powered off all power control widgets (gps, bluetooth, etc) live wallpapers were off set screen brightness to 43% began playing a .mp4 video (using tunewiki) taken from my itunes library and put onto my sd card when the movie finished, I would start it over The idea is to test the battery in as controlled environment as possible, so others can replicate it. also, so I can compare to other devices. The battery drained very consistently. about 50 minutes of video playback killed 15% of the battery. this ratio kept very constant until I just stopped it with 20% life left, so I'm pretty confident in saying that under these conditions - which are pretty ideal - I can eak out about 5.5 hours of video playback. this jives with my suspicion that the battery drained about twice as fast as my old Iphone. Iphone 3gs claims 10 hours of video playback, which they probably got under conditions similar to what I described above. I would love if other people ran similar tests. this would help confirm or deny whether or not there are "bad" batteries out there. if you want to keep it simple, just note what % your battery is at (using the battery widget), play 50 minutes of video under the conditions described above, then report back what % of the battery you lost.