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With an eink display, shoudn't 500 mAh get you quite a bit?

Kindle Paperwhite is 1420 mAh...

> Battery: 5 days standby; A few hours talk time.

It's the same Qualcomm chip as in smartwatches. Unlike a watch, calls will drain the battery.

As soon as you tackle the display, the problem becomes android, and the need for connectivity, ie radios that are always/often on