MacBook Pro Battery cause of Heat?

I was at the local Future Shop and noticed they had an pre-speed-bump MBP on display that had the battery removed and was plugged into the AC. I noticed that this reduced the heat quite substantially. I would test this at home but I returned my MBP two weeks ago due to some dead pixels and I am waiting before I purchase another one.
Anyone have a similar experience? (albeit removing the battery defeats the purpose of a portable machine)...
Love,
O.

Also, it's
not recommended to do this as you can break the
processor. It's not meant to run at those speeds for
prolong periods of time
Core Duo CPUs are designed to operate between 1000 MHz to whatever the maximum that CPU supports. Nothing will break, and if anything, the CPU would probably last longer. However, due to reduced performance, it's not a good idea anyway.
The reason they remove the batteries is so the enterprising individuals don't walk away with them.

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