POWER DEVICE AND POWER CONTROL SYSTEM

Provided is an electric storage device which is low-cost and can be used safely. Using the electric storage device, electric power is controlled in the home and the like. A battery 107 is inserted into a plurality of sockets of a device manager 201. The device manager 201 manages a status of the battery 107 and monitors safety and reliability. A storage system manager 202 controls a power conditioner 203 according to the storage information for performing a control of supplying the electric power to the electric storage device. A home controller 204 monitors a power consumption amount, and performs control of supplying the electric power to a smart storage based on acquired information on the power consumption amount. The power consumption amount is predicted, and supplying of the electric power and outputting of the electric power to the smart storage 200 are controlled based on the predicted power consumption amount. The battery 107 is configured to be detached from the socket of the smart storage 200 and can be used for another purpose.