These battery-life numbers are based on a benchmark test called MobileMark 2007 (MM07).

Oct. 19, 2010 - PRLog -- Imagine if automakers got together and started measuring the gas mileage of new cars with a cool test of their own making—one in which the cars were rolling downhill with their engines idling. Suddenly you'd have some pretty amazing claims: Why, that three-ton SUV gets 300 miles per gallon!
http://www.batteryfast.com/hp/pavilion-zv5000.htm
, This subcompact gets 500! In tiny print at the bottom of the window sticker you'd find a disclaimer saying that, well, um, you know, your mileage may vary.
Crazy, right? Yet that's more or less what's happening with laptop computers and their battery lives. Right now, I'm looking at a Best Buy flier touting a $599 Dell laptop that gets "up to 5 hours and 40 minutes of battery life." Down in the fine print comes a disclaimer explaining that "battery life will vary" based on a bunch of factors. Translation: you ain't gonna get five hours and 40 minutes, bub. Not ever. Not even close.
The test was created by a consortium called BAPCo (Business Application Performance Corp.), whose members are—you guessed it—computer makers and other tech companies.
http://www.batteryfast.com/hp/v6000.htm
AMD, the No. 2 maker of microprocessors, is a member of BAPCo, but now has become a whistle-blower. AMD says PC makers know full well that the new tests produce misleading numbers, but they are touting them anyway.
AMD is recommending computer makers adopt a new way of measuring battery life, using two states: "active time" and "resting time," similar to the way cell-phone makers describe the "talk time" and "standby time" of a phone. A Dell executive says that approach makes sense, http://www.batteryfast.com/dell/inspiron-6400.htm
and that the company is considering providing customers with information beyond the MM07 scores. "Customers expect the advertised battery life to reflect the way they really use the product," says Ketan Pandya, head of AMD-based products at Dell.

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