Hi guys,

I'm new at this and hopefully I've posted this in the right section. I have a 13" Macbook Pro Aluminium unibody and I was reading on the Apple store that i can purchase an extra rechargeable back up battery for this. My question is how would I connect this to the Macbook Pro? Are there special cables or something that need to be plugged in as I have looked all over my Macbook Pro and there is now where this rechargeable battery could plug in to.

Does anyone have one of these to advise as it's a lot of money if it's not the correct thing.