Thanks for the answers. I will try profilematic, but I don't use skype or facebook. Or nothing like that, plus when power saving mode goes on, it doesn't close Wazapp, it just disconnects it from the internet by closing all connections and whatever else it does, and the difference it makes is very big.

Right now, I have disabled smartsearch, rebooted. It's connected to wifi and wazapp is on, and the battery screen of settings says: 88% of battery and 19 hours of time left. State of battery: Good. Is this normal? I will try closing wazapp and disconnecting from wifi without turning power saving mode on.