From my experience on the first DT, screen brightness is a huge factor in how long the battery lasts. Personally, if I have the brightness set at higher than 50%, I have problems lasting through the day. If I keep it around 25%, I can get through the day and into the next day, assuming I'm not on the phone with the screen on. I always have the adaptive brightness on. When I watch video, I turn the brightness way up to about 75%. I didn't get a phone with this nice of a screen to have it dimmed way down so I can't enjoy it. On the other hand, I don't need the brightness turned up for doing everyday stuff like messaging, fb, and web browsing wasting the battery.
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