I think my Note 3 has started to drain terribly fast

[kro9s0]

Hi all there. I have a Samsung Galaxy Note 3 which I think has started to drain terribly fast, so I go into the battery status to see what happened and it claimed the screen is draining most power. However I’ve turned down the screen all the time without auto brightness, but only one hour my phone has gone from full down to 80% without any use. I am into an slim extended battery from mpj for troubleshooting but before I make the decision, are there any thing I can do to fix the problem? Thank you.

 

[hang-the-9]

Is the screen on for that one hour? Turn off the screen and see if the battery still goes down. It may be an application that is running or using WiFi or cell data.