Latest update and battery life

Wtfffff m getting jealous at you people!!! Wtfff is wrong with my Lumia 925 ! It lasts for 4 hours only! All apps are not allowed for background! Only WhatsApp is allowed! Still my battery is getting drained 1% per 2-3 minutes! This is so crazy!! Please someone help me!!!! :(
It's WhatsApp. Pathetic hack API app. I don't use it.
 
For people who believe theres an improvement, did you hard reset the device without a restoral or are you using the initial install?

No hard reset after this update. My original 8.1 upgrade was vanilla with fresh start.
 
I thing that its improved . I am with 7 hours at 40%. With wifi and data connection on and streaming music watching an 45' episode online , 30' YouTube , surfing the internet and tapatalk on wpc forums
 
I had already changed the email sync to manual, and I don't have WhatsApp.
Don't see why you won't get good battery. With 8.0 I used to keep location off but today entire day I had location on and still came home after 11 hours with 51% battery left. I'm more than just impressed with this new update.
 
The issue with battery saver reporting wrong charge percentage still exists, it had been stuck on last charged back 1 hour ago status even after probably 5-6 soft resets, battery life hasn't improved either. Btw I'm on an unlocked Lumia 920
 
Battery life is better on my Lumia 1020. I did a hard reset and also I noticed that the battery saver now shows internet explorer doesn't have background option toggle.

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I've it on my phones
 
Battery life instantly improved on my Lumia 920. I was using it for a pretty good bit of time today and the battery drained at a pretty slow rate. I'm very happy with the update.