If your phone screen became a 75hz e-ink display I'm pretty sure that would actually drain your battery faster than currently, which I assume is once per day. Would you accept that compromise of going from weeks to <1 day?

Curious.

Just an anecdote, but my phone ran out of battery most often when a full charge lasted almost two days. It made me lazy about charging at night. Now I have a wireless charger next to my work computer and in my car, I probably don't need to charge at night any more. Granted, I'd prefer a large battery when I'm traveling, but battery size is less important to me recently.

I'm curious too. But I would definitely take the risk and purchase such a device, so long as it comes with an EMR stylus.