Many devices make battery replacement a task for skilled technicians with special soldering tools, and even tricks to remove the access cover.
If you have a shop that repairs Phone/Tablet screens, you could take them the battery for installation (do not expect them to stock most batteries for reader devices).
Do expect to pay a fee for the service.
You are probably luckier if your devices is e-ink as the battery gets less frequent charge cycles, therefore lasts longer.
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