It's not only to make them run longer - they're reducing the peak demand on the batteries to avoid spontaneous shutdown when the aged battery can't handle the load.
This seems like a good idea, and it appears to be well executed (ie it's not apparently based just on age or milage like a crappy car maintenance reminder), but Apple should probably have something in iOS that tells people their phone is running slow because the battery is 2 years old.
This seems like a good idea, and it appears to be well executed (ie it's not apparently based just on age or milage like a crappy car maintenance reminder), but Apple should probably have something in iOS that tells people their phone is running slow because the battery is 2 years old.
[1] https://techcrunch.com/2017/12/20/apple-addresses-why-people...