Go Fullscreen to Boost Your MacBook's Bad Battery Life
Different MacBook owners will have different gripes with all the changes, but one problem that most can agree on is the laptop's poor battery life that would fluctuate anywhere between four and 16 hours of use. Luckily, according to NotebookCheck , you can squeeze a few extra minutes out of it with a pretty easy keyboard shortcut.
Testers put the current 15-inch MacBook Pro through its paces in a battery runtime analysis, and found some confusing results. While one test of the MacBook Pro during a video playback test yielded a battery life of eight hours and 31 minutes, the same test on another MacBook Pro ran for over 11 hours.
"Measuring inaccuracy and mean variation aside we were stunned and unable to find an explanation at first. Surely, the slightly different hardware could not possibly be the culprit, could it. So, we started digging."
The way your MacBook plays the video can determine how much power it uses. When playing the video in fullscreen mode (easily achieved by hitting Shift-Command-F) the laptop draws less power and can even last long enough to play another film.
The testers deduced the operating system uses fullscreen mode as a cue to discontinue some background tasks to decrease battery consumption while you're watching a movie. When watching in a window, even if the window itself was maximized, the MacBook Pro consumed more power. If you're not watching a movie or are bouncing between apps, you can also extend your battery life pretty easily with simple tricks such as decreasing your screen's brightness, turning off connectivity options like Wi-Fi and Bluetooth, and taking a trip into your activity monitor and killing energy-hogging tasks.