If you’ve been wondering how the iPhone engineers managed to eke out some extra hours of battery life between Macworld San Francisco and now, Slate has a story for the battery geek in all of us (there is a battery geek in all of us, right?).

There wasn’t any silver bullet in this case, according to the author, but a combination of Apple selecting energy-efficient component chips from the manufacturers they’re working with, using Mac OS X’s power management to turn off components not being used, and the recently-announced glass screen (which requires less backlighting to produce a bright display).

Filed under: iPhone News