I'm pretty sure this isn't true. I believe the update slowed batteries down based on their available peak voltage, which would be the difference for a user like

I'm pretty sure this isn't true. I believe the update slowed batteries down based on their available peak voltage, which would be the difference for a user likely to experience shutdowns. Anecdotally my iPhone 6 seemed not to have a defective battery and was significantly more responsive than my dad's iPhone 6 purchased within a week of mine. This (again, anecdotally) seems to support apple's claims that they were not solely using 'age of the battery' to determine whether or not throttling was necessary. > This power management works by looking at a combination of the device temperature, battery state of charge, and battery impedance. Only if these variables require it, iOS will dynamically manage the maximum performance of some system components [0] https://support.apple.com/en-us/HT208387 https://support.apple.com/en-us/HT208387