“Apple has been working on a fix that will be distributed with the OS X 10.8.1 update,” Bell reports. “And according to one registered developer who’s currently testing the beta, it significantly improves battery life by adding up to four hours.”
“‘Until I installed 10.8.1, my MacBook was showing 4h:05m after a full charge,’ he told Softpedia, referring to the amount of time his MacBook had before the battery needed charging again,” Bell reports. “‘After installing 10.8.1 it’s showing over 8h,’ he said.”
Read more at http://www.cultofmac.com/185957/developer-confirms-os-x-10-8-1-update-significantly-improves-macbook-battery-life/#IGwTu7VpfbhFRera.99
Read more in the full article here.
Tests show OS X Mountain Lion may degrade battery life for portable Macs; fix likely due soon – August 9, 2012