Worth mentioning here is that this wasn't just about the "sneaky" fix for battery degradation, it was about doing this without notice , and having internal tooling that would deny a replacement (even at full retail price) if the battery was above an arbitrary health threshold (but still low enough to cause throttling). Before Apple changed their tune, if you read about this, and went into an Apple store for a replace…
Hi, Battery engineer here at an electric vehicle company. The crux of it is this: when you draw high current from a small battery, the voltage will sag (1). The manufacturer has an on-board battery management system that MUST turn off the battery if it goes below a certain voltage threshold. As the battery ages, the sag effect increases significantly, up to 2-3x. Thus, when your phone clearly indicates say 20% batter…
"The battery in your iphone has degraded. Phone performance will be lowered to ensure stability. See an apple store or visit apple.com/battery to have a replacement battery installed"
It would have been so easy.