2nd battery 8540p

Hello

I've been looking for awhile now on where to buy and how to install a second battery for my hp elitebook 8540p. I go to school and do not want to lug the power cord from every day. I saw the external battery packs online that would be just as large as the power brick. is it possible to install the second battery without comprimising width too?

Thank you

M

Mast.

http://www.eBay.com/ITM/genuine-HP-EliteBook-8530P-8530W-8540p-8540w-8730W-8740W-extended-travel-battery-/141363113344?PT=Laptop_Batteries&hash=item20e9e5ed80

REO

Tags: Notebooks

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