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I would leave it on charge for 24 hours or more. Takes more than 5 hours to fully charge from full discharge. It can't over charge unless defective and should be under warranty. Kobo or chapters should help you with warranty repairs or replacement. If your not using it for long time hold down on/off button until light comes on should turn it off while a short hold down on/off button sends it to sleep mode which drains battery faster than off. Wifi coming on to check for subscriptions should be set off to get max battery life.
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