My battery used to remain up to 80 to 90% overnight, but since the new firmware upgrade, the battery goes down to 50%. Anyone has experienced that kind of issue?
Something is running in the background charge the battery to 100% let it go to sleep for a few hours then check the usage time compared to the standby time and post a screen shot.
What iOS is that? Downgrade if u can.
Have you tried turning off Ping. "Settings > General > Restrictions > Ping = Off