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I have gone though one full cycle and it seems like it does last longer. (could be the placebo effect though)

Normally I get up at 7 and after a day at work till 6 I come home and have to charge, or at most have only 15-20% of the battery left. After yesterday I had 40% left and it made it though the night without giving me a low battery notification. And if IIRC I used my phone more yesterday than usual. I was one it for I know of 2 hours (one with a companies CS, another with my fiancee at the end of the day)