It's one of those things we take for granted: official laptop battery life claims have an extremely tenuous relationship with reality. Not surprisingly, everyone's using the same tricks to conjure their silly estimates—and they don't plan on stopping.

AMD, as part of a some kind of PR campaign, is saying the culprit is a battery testing suite called MobileMark 2007..

 http://gizmodo.com/5295188/why-laptop-battery-claims-are-so-useless-and-why-that-wont-soon-change