What's the more powerful internal iPhone battery for $5.99?

[uRabbit]

I saw somewhere that there was a more powerful internal iPhone battery for just $5.99. Only catch was you gotta install it yourself.

Well, I'm looking to purchase this puppy, along with the new Case Mate Fuel Lite case.

I thought I'd bookmarked the page or topic that this battery was shown on, but I cannot find it. Anyone know?

Forum and Google searches turn up nothing. "/

And does this void the warranty?

 

[Eric559]

And does this void the warranty?

Of course. Your opening up the phone.

 

[uRabbit]

Well does anyone know a link to it?