What battery for my gf's old white macbook?

Looking to buy a macbook battery for my go's old macbook. Its the white one, bought in 2007ish for 999$.

She can't use it without being connected to a power source, so die like to buy her a battery for christmas.

Is there a difference between the available batteries? I was looking at Amazon and saw these...

Amazon.com: Customer Reviews: Replacement Apple Macbook 13-Inch Battery, 5600mAh

Amazon.com: Techno Earth® NEW Apple 13" Macbook Rechargeable Battery A1185 White (equivalent): Electronics

But the reviews on those aren't so good.

Are these cheap batteries worth it? Are they the right ones? Should I spend closer to the 100$ mark and get a better battery or does it matter that much?

Would you go to the apple store or buy online?

Thanks

I have the same computer, go to your apple store and they should have an OEM replacement.

Another option. Quality Battery Options for Apple MacBook, MacBook Pro, Powerbook G3/G4, iBook G3/G4 from $69.00