No app killers, no battery saving apps. I find they tend to kill my battery faster. I didn't use my phone as often that day though, but it's nice to know when I don't the battery will give me some killer stand by time! With heavy use yesterday I got from 6 am off the charger through to 2 am with 15% left. I had been heavily using it all day. My RAZR would have been dead by lunch time lol. I freaking love this thing.
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