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Well, from my experience the eInk screen will likely crap out long before your battery - so personally I'd recommend you reconsider your requirement of the User changeable battery.
To make a note of "getting him books" I'll mention that for my Mom and her Kindle - when all else fails I have her leave her 3G on and I email the books direct to her Kindle using Calibre. It costs about 15cents a book to do that for us (I'm not sure of International 3G email rates) but it saves alot of hassle. She sits there and waits and I can do all the work remotely. I don't know of any other eReaders that have that function but maybe somebody does. Can you do that with a nook?
I've done some work at the Library and Senior Citizen Center teaching how to use eReaders and from my experience those with hand control problems really like the Kindle with its left and right side buttons choices. I admit that they seemed to do much better with the larger buttons on the K2 than the K3 with its skinnier ones.
Also remember that on the Kindle you can turn the sound all the way down on Text To Speech and then the page turns happen automatically. I use that all the time when I'm on my treadmill for hands free reading. I assume the Pocketbook with Text To Speech might be able to do that also, but I've never tried it out.
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