Shipped earlier this month, Apple’s mid-2012 MacBook Air computers are performing better than advertised, as far as battery life is concerned. The discovery is most welcome, given the public’s skepticism regarding the marketed lifespan of Li-Ion batteries between individual charge cycles.
After carrying out admittedly "unscientific” tests on a 13-inch mid-2012 MacBook Air using real-world scenarios, OS X Daily
managed to squeeze
as much as 8:25 hrs out of the notebook’s battery – more than 1:25 hrs over the 7 hours of productivity
advertised by Apple.
Calling the battery life on the new MacBook Air “simply phenomenal,” the reviewers carried out tasks that could be considered “typical” for any laptop user.
Some real-life case scenarios are outlined below. In front of each scenario is the battery life duration after a full recharge: · 8:25 – screen at 40% brightness, keyboard backlighting on 50% brightness, light web browsing with Safari (no Flash plug-in installed), and text-based work in TextWrangler and Pages
· 6:45 – screen at 70% brightness, otherwise same as above
· 5:33 – screen at 80% brightness, keyboard backlighting on full brightness, heavy app usage
· 4:15 – screen at 100% brightness, keyboard backlighting on full brightness, heavy app usage with tons of apps open including Chrome (with Flash) open with about 25 browser tabs, image editing in Pixelmator, using 6GB of RAM, while driving an external 22″ display
· 3:40 – screen at 80% brightness, reasonable app usage, heavy wi-fi usage downloading 16GB sustained at 1.2mb/sec
The tests further showed that there was sacrifice in performance – “these are still the fastest MacBook Air models ever made” – and that heavy internet usage over WiFi seemed to drain out most of the juice.
“Downloading a large file over wi-fi plunged the expected battery life dramatically, even with screen brightness reduced,” according to the review.