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Was it used after charging it? Dropping from 90+ if powered off to 70 something seems a bit odd.
The thing you must remember is that the charge percentage being displayed appears to be an interpolated value(more like a guess in this case) based on the voltage level as measured near the battery. When the device is charging the higher incoming charging voltage skews the reading which explains why it often drops a bit if you unplug before charging has completed. I suspect the interpolated value gets to 100% a bit before charging is finally terminated because the Kobo tends to stay at 100% for a considerable period during discharge and rapidly diminishes somewhere below 30% -in my experience.
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