The battery is very hot. Is this normal?

After about 10 minutes the bottom of the laptop is so hot I can't have it on my lap. There was a problem with batteries several years ago and my old (2003 or 2004)laptop battery was replaced. This is a newer late 2009 MacBook Pro and I cannot find where there is any published problem regarding these batteries. I'd hate for the thing to burn up in my lap.

"the bottom of the laptop is so hot I can't have it on my lap."
Apple instructions say you  are not supposed to use the computer in your lap without a lapboard or other surface that allows circulation under the case. The case bottom has been an integral part of the heat dissipation system since the aluminum PowerBooks.
here's the Apple documant:
http://www.apple.com/support/macbookpro/care/

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