Correct battery for 2006 laptop?

Hi, anons.

I've had this laptop since 2006 and recently reformatted it and installed Windows 7.

http://www.newegg.com/Product/Product.aspx?Item=N82E16834114263

The battery's old and probably needs to be replaced, right? I'm having trouble finding the correct model battery for it. I don't want to accidentally buy the wrong thing.

Any advice?

Thanks in advance.

http://www.amazon.com/Battery-Toshiba-Satellite-R25-S3503-DENAQ/dp/B002UO1LRA

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