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A "proper" LiIon-Battery fuel gage measures the voltage to know if the battery is completely full or completely empty and integrates over the current going in and out of thew battery. By monitoring the current it will, in theory, always know the charge in the battery.
In reality there's measurement tolerances, self-discharge, aging and so on that introduce a drift between what the battery gage thinks the charge of the battery is and the actual charge.
A proper calibration cycle measures a full charge cycle from completely empty to completely full and a full discharge cycle until empty.
The question is what type of battery gage the Kobo actually has.
If I remember correctly the sysfs tree doesn't expose the charge current which leads me to suspect that Kobo's battery gage doesn't measure the current but estimates the charge from the voltage. And this will always be very inaccurate.
Regards
Aydan
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