Error-13 indicates that machine charging failure: poor contact results because the charging area is dirty; please clean the charging contact in the machine tail and the contact tab of the dock charger after power off and disconnection from the dock charger; poor contact of the power cable of the dock charger. Please check whether the power cable is inserted in place; the dock charger is placed on an uneven floor or on a carpet. Please place the dock charger on a level and hard floor and lean against a wall.