Reduce the screen brightness to 50% via Settings Switcher which can be found in the app tray
Make sure no unnecessary third party app is running in the background/notification tray
Open MX Player, go to Settings >> Player >> Screen and make sure the Brightness control feature is not ticked. This way you are rest assured that your video will play at the actual 50% screen brightness set before.
Start playing your video, then long press on the Next button to reveal a popup that allows you to Loop the video. Tick Loop one
Plug in your earphones and set to a comfortable volume and start timing your video.
Stop video playback at 10% of battery life and calculate time spent *watching* your looped video
How To Run A Web Browsing Battery Life Test
Dolphin Browser offers the coolest browsing experience on Android IMO so we’ll be running this test with it. Also download the addon Dolphin Tab Reload and Wakey.
Turn off all internet connections except Wi-Fi
Launch Wakey, hit the bulb to set the screen to permanently on.
Launch Dolphin Browser, go to Tab Reload and set it to reload every 15 seconds.
Connect to the Wi-Fi network, load a page of your choice and leave the device close to the router for stronger signals