Burek on 26 November 2014
Same as others, mine lasts about 7-8 hours. I never play that much at once though, so I guess I can say it lasts 3-4 days.
I suggest not buying anything extra, no sense wasting money, when you can just use your smartphone charger in between sessions. It takes about 2-3 hours to for a full charge (0-100%), so I never consider the battery life to be a problem.
(Unless you play 8 hours straight, but then you have more problems than just the battery life)
