15% in 10 minutes? That seems to be very quick drainage!
I was charging mine around once a day but I'm finding (after a couple of weeks) it's improving slightly, the current charge has lasted around 2 days. Whether that's the battery getting better or me fiddling with it less I don't know, maybe a bit of both - I still fiddle with it a fair bit.
Are you running anything that's particularly draining for the battery? WiFi's the most obvious one. There are some battery apps people will recommend (sorry, don't use them myself) that will show you what's draining the battery most.
I believe current advice is to charge your phone often anyway, rather than full discharge/recharge cycles.
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