Macworld's battery test
I like to go by Macworld.com's battery comparison tests for Apple's portables. Not because they're accurate for day-to-day operations, which they're not, far from it, but it allows a standardized testing across models which makes it rather reliable and believable in determining battery duration.
What they do is they turn up the brightness to the maximum and load up a full-screen movie ripped from a DVD, in a loop.
However I noticed something strange while reading the battery test for the new 2.0GHz white MacBook with Nvidia GeForce 9400M.
James Galbraith's testing yield 2 hours and 42 minutes which he claimed to be 10 minutes longer than the previous MacBook running a 2.1GHz processor with Intel X3100 graphics and 6 minutes longer than the 2.0GHz unibody MacBook.
I found this odd because Macworld's own testing a few months earlier came to different results. Aluminum 2.0GHz MacBook ran out of juice after 2 hours and 33 minutes, which still fell in line with the new results but the older 2.1GHz MacBook ended up with 2 hours and 57 minutes.
This means the older MacBook's battery last 15 minutes longer, not 10 minutes shorter, than the current MacBook's battery.
Do let me know if I mistook the results but that's how things look from where I'm sitting.
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