Onyx is the only one I know, and I thought they only do 7.8", but I may be behind the times. The text will be less clear than on a B/W screen, but that is true of all color e-ink. Regarding battery, it was a relatively simple process to change the battery on my Nova. You could order a battery and put it away. When the battery eventually dies, take the device and battery into a tech guy and get him to swap it out for you, or do it yourself. Personally I am finding more and more that DIY battery replacement is a reality for modern devices.
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