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I have got an old Kobo Glo that does exactly the same. Battery is very old and weak and the charge controller is way out of sync. It does recover some when you let it drain fully and then charge it back up using a slow (<500mA) charger. I actually took mine apart and charged the cell with my proprietary charger, still showed 821mAh out of the 1000mAh it once had. Not bad for many years of service.
When a device is new - like under two years new - it shouldn't act like that. The charge chip is well aware of the Li-Ion discharge cycle and should measure incoming and outgoing energy/amperage to accurately display the SoC - State of Charge.
Sometimes these devices just need a bit of calibration when they get older.
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