My Kindle can be read for about two weeks without a charge.
I like the old-style books, which no one controls for me or knows about.
I had a relative who didn't like making the change from stone tablets to scrolls, but eventually he made the crossover, understanding the utility and ease of the newer technology.
I was thinking more about a TEOTWAWKI scenario. Kindles ain’t gonna work then. Anyway, I just like to smell my books.