Just an update on my KF battery life:
Took off YouTube - seemed to take battery life even if I wasn't using it. Vevo is behaving (so far).
I unplugged my KF at 8am. I streamed 5 episodes of a TV show yesterday (42min an episode?). Tried to kill some pigs for a few minutes. Browsed a few sites on Opera. My battery was at 70% at 9pm.