What I believe mthoms is saying that the "battery management" software was the secret thing, because it was. We all have a basic idea that when your battery is going bad you should replace it, I imagine, but the software fix Apple silently pushed out arguably prolonged battery life at the expense of making the phone run slower. But if the Apple Geniuses weren't told this was happening, they wouldn't be able to say, "Oh, yeah, your phone's turned on battery management because your battery isn't doing well."