Cheers I've given it a tryHow to enter the Galaxy S7 recovery mode
Switch your Samsung Galaxy S7 or S7 edge completely.
Boot into Galaxy S7 recovery mode by pressing and holding Volume Down, Home and Power keys at the same time.
Release all three buttons when Samsung Galaxy S7 screen flickers and you see a warning sign.
Press Volume Up to continue to the main screen of Recovery mode. Or, press Volume Down if you aren’t sure and want to go back to the normal mode.
You are now in the Galaxy S7 recovery mode, aka download mode. When you want to switch back to the normal mode, you can simply use the Reboot option. At any time, you can also exit the Download Mode by pressing the Power button for about ten seconds. This trick also works in cases when your device gets stuck while you are in the Download Mode.
I don't want to turn features off to save battery as that's not why I bought it so hopefully it improves.
Just can't get why google services is using so much. It's down to 17% now though