Hey,
Do you happen to have the Sygic navigation app installed on your phone? because i had the same problem with my battery after the update, and i found out that when you run the app, it makes the gps start looking for a lock and after closing the app, the gps stays enabled (with no icon on the top bar, so you won't know it). Go to "settings", then "location" and make sure that the gps is not enabled.