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I thought that throttling in iOS 12 could be disabled through the software, under Settings.

• ericabiz 8y ago
  You can, but the whole point of throttling was that iPhone 6s with older batteries were shutting down randomly, particularly in cold temperatures. The batteries were not able to deliver the voltage the phone required, and as a safety measure the phone just shut down. Apple introduced throttling to combat the random shutdowns. Of course, Apple being Apple, they did a remarkably poor job of explaining all of this. It took them until people filed lawsuits to introduce their "battery health indicator", and even now people don't really understand that slow performance can often be fixed by a new battery.