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I don't think that replaceable battery would make a huge difference. Look at the world of mobile phones: devices with replaceable batteries are now going extinct and most of people didn't even realize it.
If you need more power it's better to have a powerbank around that can be used for various devices. Standard powerbanks are also cheaper than e-ink batteries and comes in various shapes and sizes.
If your battery breaks and needs replacement you just need a screwdriver and fiddle with it a little.
Making batteries replaceable requires a complete redesign of hardware and less space for other components - In my opinion it's not worth it.
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