Well, they've actually done kinetic charging smartphones, but it had a battery and i believe it was extremely expensive.

So if you did that and instead of a battery combined it with a (relatively large) capacitor (or some sort of amazing spring) you could have the iPhone equivalent of a shake and shine flashlight. (One bonus being that there would be absolutely no holes, as it would not be possible to charge it via a wall outlet).

It would be completely impractical, but there wouldn't be a battery, so the battery wouldn't degrade. The alternative storage mechanism might degrade, and who knows what all of the shaking would do to the delicate electronics, likely nothing good.

Anyway, I think it'll catch on. I look forward to watching young people on the train shake their iPhone vigorously before making a silly face and taking a picture of themselves in 10 years time.

Let the user toggle between 1 and 2? Which could be useful for new phones where, even though currently full, you know you won’t be able to charge next.

> Let the user toggle between 1 and 2?

Wrong company, pal. Apple historically decides for the user. Heck, they still do it with their App Store. Often that may go right, but not always.

Apple already includes a low power mode toggle. It could be updated or altered to account for this.

For comparison, my Samsung phones have had CPU underclocking in the low power modes. I'm not sure if that's true of all Androids or not.