Ars Technica has published a report outlining some testing that they have conducted regarding battery life on MacBooks and OS X Mountain Lion. Complaints had been building on Apple’s Support Forums since Mountain Lion’s release late last month regarding shortened battery life under the new OS.
Chris Foresman, the writer heading up the battery testing at Ars, found that his Retina MacBook Pro test unit saw a 38% decrees in battery life after updating to OS X Mountain Lion. Before the update, Foresman reports that he was routinely getting 8-hours of battery life. Sadly, Foresman could not identify what runaway process or software that might be the culprit.
For what it’s worth, I’ve noticed a sharp drop in battery life on my 2011 MacBook Air, after updating to Mountain Lion. I wondered if this was just my perception, only my machine, or some other magic at work. In a weird way, it’s comforting that others are experiencing this problem- this way we’ll hopefully get a fix from Apple in a timely manner.