I have never run out of battery during a day. I would say it lasts about 24 hours with moderate usage for me.
One of the biggest reasons I went with a BlackBerry was the long battery life and the small size of the Q10. It is common to see Iphone users charging their phone when I go to my university library, but I just did not want to take part in that.
There are phones that last longer than Q10, but they are the phablet sized phones. I would say that the Q10 is one of the best in terms of battery life when you are talking about normal - small sized phones.
IMO,
Its really depending on your carrier, if you are at great signal area, your battery will last longer. If you are travelling often, you cant tell when your battery will die.
My battery goes from 100 to 97 in a matter of minutes. Kinda strange. I also turned off blackberry link in settings to see if that could help and not seeing much improvement. I think the update has some bugs that BlackBerry hasn't pushed a quick update out to to fix. I wish they would. But unfortunately we have to wait until a much larger update comes out. Until then we have to make due with it. Of course a battery replacement is a thought as well.