First, the bad news: three sets of separately-conducted independent tests have confirmed what many users suspected -- the initial release of Mountain Lion contained a bug that severely decreased battery life in the latest MacBook models compared to previous releases. The good news is that those same tests show that the not-yet-released 10.8.2 update, currently in beta testing, may fix the issues -- and possibly provide slightly better battery life than has been previously seen in any OS version tested, going back to Snow Leopard.
