If it's completely discharged, plug it in _now_, to a wall charger or awake computer.
What was it plugged into? I'm wondering if you'd plugged it into an awake computer, it charged, so the screen was showing "Charged"; but then the computer fell asleep and drained charge.
Your best next bet is to plug it into a wall charger. If it doesn't charge, change the cable. If that doesn't work, call Kobo.
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