I don't know, but there seems to be not very much incentive to invest a lot of R&D dollars on this problem from a manufacturer standpoint:

* Devices marketed on how long they last on a single charge, but much less often on how quickly the battery degrades * Batteries are a later upgrade upsell opportunity * I would not be surprised to learn that a significant number of device upgrades start as simply wanting a better battery (but why not upgrade at the same time)

This is often the case. Not all the time, but lots of devices have started doing this.

This is definitely the case for the Prius, even from 2004. I really doubt higher-end manufacturers like Apple wouldn't do the same since they control the entire stack.