Go into settings by pressing Windows key + I and in the area where it says, 'Find a setting' type 'Battery Saver' and click on 'Battery usage by app' to see which app is usurping the battery the most. Then in the same 'find a setting' area type, 'Background apps' and then choose which apps should be allowed to run in the background. Clearly you have some background app(s) which are draining out your battery and then you would be advised to first identify the app(s) and then turning them off from running in the background.