At the end of 2016, Consumer Reports released their report for their 2016 MacBook Pro testing which revealed some unfortunate battery life issues. To make it worse, the results kept showing inconsistency with the battery life shifting from 3.75 hours to 19.5 hours.
Thankfully, Apple has been working with Consumer Reports to get to the bottom of this. It seems that it could be due to two reason; the first one pertaining to how the notebooks were tested.
Consumer Reports usually runs battery life tests on its computers by opening a series of locally stored websites on the default browser. They would then set the display to maximum brightness and allow the battery to run it course as the computer goes through the websites.
In order to ensure all machines are comparable, Consumer Reports turns off some features, including caching of website data. Apple has discovered this to be a problem as the figures provided have taken count of caching of webpages, which is the default behavior in Safari. This proves that Consumer Reports did actually move away from the default behavior of users.
The second reason is a result from the first reason. As Consumer Reports’ method of turning off cache in Safari had caused a bug in reloading icons. The tech giant has fixed the bug and it will soon be released to the public.
Following Apple’s input, Consumer Report’s battery life tests for the MacBook Pro models finally matched up to Apple’s claims and they would be releasing the complete results soon.