Too long charging time of the card-inserted early education machine may lead to overheating, which may lead to a fire. Charging for a long time will lead to overheating of the battery and increase the risk of fire. Moreover, some cheap or low-quality chargers may also have potential safety hazards, such as overload and short circuit, which further increases the possibility of fire. Therefore, the plug-in early childhood education machine will catch fire if it takes too long to charge.