Yeah, the whole battery life spec is so hard to nail down. In most cases, I’d say that most manufacturers exaggerate (some more than others) and they never say exactly how they test or where they get the figure from.
It is a hard thing to measure since everyone has their own preferences to what applications they’re running, how bright they have the screen, etc.
The TR does still have pretty phenomenal battery life considering everything. Yeah, those desktop replacement laptops basically don’t have any battery life…especially the straight up P4 versions. The battery on those units is usually so pathetic that they really only serve as portable UPS units.