Battery drain after 8.1

[AV2RY]

Hi there. I have terrible battery drain on my 928. For the last 30 min from 43% my battery dropped to 25% and I'm only using WhatsApp. I turned off All apps that are running in background. As I type here it dropped 3%. Any idea what's going on, or any solution for this except Hard reset?

 

[xandros9]

Are you using WhatsApp nonstop?
I've found continuous FB Messaging can kill my 920.

 

[AV2RY]

Yes nonstop. I only left whatsapp to write this (OP). And even while I was writing that I lost 4% I think