I see no reason to spend the money to replace my currently 3 year old MBP in the foreseeable future. Barring breakages, I will probably be using this thing in t

I see no reason to spend the money to replace my currently 3 year old MBP in the foreseeable future. Barring breakages, I will probably be using this thing in to 2015, even if it isn't getting OS updates by then. I wonder how long Apple keep stock of replacement batteries for older models.