As SWC said, why in the hayull would you buy a new phone for just the battery if the cost to replace it is $85 vs. $200 for the phone? If Apple uses that 17-inch MBP-style battery in iPhones and gets about 40 percent better battery life, then I'M ALL FOR IT. I think I have replaced two cell phone batteries in my life -- because the phones were usually so crappy that I would just spend $0 on a better one with another 2-year contract.