For those of us who have been running OS X Mavericks since it was announced at WWDC in June, it’s been obvious for a while that OS X Mavericks is a complete miracle when it comes to battery life. Installing Mavericks on any MacBook is enough to eke an hour or so more battery life out of it, but especially when running on MacBooks boasting Intel’s power-sipping Haswell processors, it’s a game-changer.
What kind of battery life increases are you looking at on, say, a 2013 MacBook Air? Up to 30% improvements, according to legendary Apple OS reviewer John Siracusa.