Depending on the model, intelligent wall chargers regulate the power flowing from outlet to electronic device. Smart chargers can stop power so that there is not unnecessary draw once charging is complete.
A phone charger plugged in continuously can draw up to 8,000 watts of unnecessary energy. A charger draws approximately .23 watts of power even when a device is not connected to it. Smart chargers address the problem of plugged-in power cords drawing energy when it is not needed, which is sometimes called standby power or energy vampires. Additionally, intelligent wall chargers limit heat output and minimize the risk of fire.