Actually more a "thinness" secrets bared
http://news.cnet.com/8301-13924_3-20043933-64.html
Quote:
How did it do it? The biggest reduction in thickness came in the iPad 2's battery subsystem, wrote Kevin Keller, a teardown analyst at IHS iSuppli, in a research note today. This part of the iPad 2 is 2.5 millimeters thick, a 59 percent reduction from the 6.1 millimeters of the original iPad, according to Keller.
"The iPad 2 battery design represents a major shift from the iPad 1," Keller said. "Apple moved from two thicker cells to three thinner ones, flattening out the entire battery structure. The new design also allowed Apple to eliminate an injection-molded plastic support frame from the battery subsystem, further cutting down its thickness."
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Reduced the battery thickness 59%, increased the speed, and maintained the 10 hour battery life.