The latest macOS Sierra beta of Apple Inc. for developers has an interesting little feature addition in the power department. The feature warns MacBook user when the display is rendering a significant energy.

Originally spotted by MacRumors, the latest macOS beta installed a new Display Brightness warning on a person's MacBook that shows a significant energy drop-down from the battery icon in the menu bar. While this previously showed MacBook user which apps were potential culprits, macOS beta will now also list a user's display brightness if it is set above 75 percent.

Tapping on the warning will lower the MacBook display brightness to a safe zone. If the brightness of the device is set below 75 percent, it will not be marked as using significant energy. A MacBook user probably don't need their laptop to be all that bright anyway if the user has one of the new MacBook Pros, given those increased brightness by 67% over its predecessors.

Nonetheless, it's unclear whether the percentage is an arbitrary choice by the Cupertino based tech giant, or if there is an essential uptick in energy usage after that threshold. In spite of that, it is the same setting the tech company uses for its claimed 10 hours of battery life on the latest MacBook Pro models.

On the contrary, though Apple's MacBooks are designed to provide the best in class battery life at 10 hours, but the tech giant's recently revamped MacBook Pro line was recently involved in a mini-controversy. The nonprofit organization Consumer Reports found that the battery life on the tech company's premier notebook line varied wildly. For instance, one test found out that the battery life on the non-TouchBar MacBook Pro fluctuated between 4.5 hours and 19 hours, BGR reported.

That being said, the new MacBook feature is currently limited to beta testers, and will be widely available when the macOS 10.12.3 is officially released.

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