My recent problem is that my Clara keeps reporting 0% charge, even when fully charged. I did a factory reset, and it reported 100% charge correctly, but a few days later, it went from reporting nearly full charge to 0% again. Once, topping up the charge made it read correctly, but then it was back to reporting 0% ... but still continuing to work, so the battery is charged.
Since the battery does charge and hold a charge, it's not a battery problem. Since it was temporarily fixed by a factory reset, maybe it's a RAM bit failure. This is more of an annoyance than a serious problem, since i can only guess when it's actually low on charge. Charging it when it doesn't need it might reduce battery lifespan, so I'd prefer to have the indicator working properly.
I did email
help@kobo.com, but never got a response.