After 60 charge cycles on my 2010 macbook pro the battery healthy is at a fairly decent 90% according to istat pro. Not a big deal since it can be plugged in most of the time anyway. But a phone is quite different, a phone spends 95%(or more) of it's life on the move, not charging. Would this be similar to the iPhones battery? If so, you'd be looking at a 10% degradation in 2 months assuming 1 charge a day. That's 30% in 6 months and 60% in 1 year!