Overheating- removing battery helps

I have a 2 year old 2.33G core duo MBP15. Temp has never been an issue but after the last OS update (10.5.5) the processor runs at >75ºC with no load. the fans roar at >4500 rpm. Reset power management and PRAM no help. Battery reads charged but removing battery solves the heating issue. Anyone have a clue? Is my battery dead. Did the OS kill it?

Mike:
It's not a good idea to remove the battery, as you can easily lose data if the electricity goes off or the AC power adapter is pulled out.
No, leaving the battery in will not shorten battery life. Apple's power management system protects the battery from overcharging.
Read the user guide about laptop use -- page 107, as I recall. No, that's not a design defect. Apple has warned for years that using a PowerBook or MBP in one's lap can be uncomfortable.
I use an aluminum tilt stand (without fans) whether my computer is on my desk or in my lap. That adds additional metal heat sink capacity and provides better air circulation under the computer. So the computer remains cooler and comfortable. Laptop trays and stands have been around for years as a common-sense solution to the fact that portable computers can be uncomfortable in one's lap. The vast majority of such trays or stands are sold to PC notebook users.

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