Battery Power Causes Laptop's Performance to Decline

Hello. I've done a lot a troubleshooting on my laptop and I've learned
that my battery is causing my computer to act sluggish. Let me
elaborate a little more...It's only sluggish when it comes to typing,
scrolling, and flash animations. Music and H.264 HD video plays just
fine, but it's mostly the text "hiccup" that's bothering me.

I've isolated it to a windows problem. (I ran knoppix and found no
problem in linux) I have also:

Scanned for viruses/spyware/adware using NOD32, spyboy, and ad-aware
Cleaned out registry with hijackthis
Defragmented
Checked all BIOS settings
Checked for corrupted memory

Thanks
.

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