Windows Phone has a problem, and that is unexpected and severe battery drain that can empty a full battery in as little as 4 hours.
Its not that Windows Phone itself has poor battery life most of the time, but every so often (and recently increasingly often) the phones suddenly start sucking down so much power that sometimes even a average USB charger can not keep the device from expiring.
Nokia Lumia 925 users have also been complaining of the issue, indicating that Windows Phone 8 GDR2 has not fixed the problem. In most cases using battery saver does not fix the issue, or even switching on flight mode, making the issue a mystery the average user can not address themselves.
Vote in our poll above to show Microsoft how many users are affected by this issue.