I have a 5S. Since the last update to 11.x iOS, weird battery things have been happening. Occasionally when the battery level gets down near 20% charge, the phone can suddenly show dropping to near 0% charge,, like 4% or 5%. then when you immediately go plug it in to the charger, it jumps back UP to where it was before,, around 20%. Weird. Only started after the iOS update. Otherwise, the battery life and clock speed seem to be about what they've always been for this phone.
It would be nice if they would stop monkeying around with the battery control stuff. If it ain't broke, don't fix it.
Mike in AR
