Macbook Pro Won't Run Past 1GHz Without Its Battery

Hello,
I've been using a Macbook Pro 2.16GHz for half a year. I just realized that the computer will never get beyond 1GHz, both in Windows and Mac OS (I checked with Sisoft, CPU-Z, and CoreDuoTemp) when I remove the battery and run on AC Adapter. However, when I pop the battery back in, MBP speeds up to normal speed. Is this regular? Thanks.

Hi palmbook,
Dont worry,this is the nature of Macbook Pros or Macbooks.When we are using our mac,the power consumption is not constant but fluctuates instead.At certain moments,the power consumption will go beyond what the AC adapter can supply...when this happens,the battery will have to provide extra power to cater those needs.
If the battery is not present at these moments,the system will simply shut down by itself to prevent any damage to the circuits and thus losing unsaved data.This is imperative for people who are performing rendering tasks as long hours of data processing will culminate to nothing in the event of such "moments".
To address this issue,the SMC(System Management Controller) will limit the usage of the CPU to 50% of its nominal speed if the battery is removed in order to prevent such "moments" from occuring.

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