The next upcoming version of Mountain Lion is expected to improve battery life, which has been a problem since the release of Mountain Lion for MacBook users.

The latest developer build indicates that Apple has made significant progress on addressing the issue and they might not be done before the update is released to the public.

While the tests that Mac Observer put the MacBooks through might not be exact, it shows that Apple is making progress on an issue that has been causing a big issue since release.

Read more on the battery life analysis here.