Fans Go Mental When Battery Charging

Hi,
Is it normal that the fans speed up to 5500 RPM when charging the battery?
Also the base of the macbook pro gets extremely hot while the battery is charging.

This seems to have done something to the battery. It is now saying 3 hours 38 minutes of use left after a full charge. Previously I was getting a lot less than that.
The trouble with the fans is NOT solved. When charging now they stay at around 4488 RPM. This is reduced slightly (1000 rpm) but still I do not understand why when the macbook is left idle while charging the fans spin like crazy.
This has only started happening since installed snow leopard.

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