> They added a software feature in an iOS update that throttled the CPU in this condition to prevent a crash, at the expense of lower peak CPU performance.

The user friendly approach would have been to pop up a warning message on next boot:

"Hey Avalys,

We detected that your battery has degraded, and so your phone's performance has been lowered to prevent your phone from crashing. To restore performance please take your phone to the apple store to get your battery reset.

Give them code AH534 to get $25 off battery replacement. Offer is valid for the next 14 days."