A straddled electric vehicle , comprising: a first battery mountable on and demountable from a vehicle body; a second battery mountable on and demountable from the vehicle body independently of the first battery; an electric motor configured to be driven by power from the first battery and the second battery and supply a drive force to a driving wheel ; an inlet provided to or on the vehicle body and configured to be connected to a first charging device installed or provided outside or externally; and a power line (PL) for charging of both of the first battery and the second battery with power supplied via the inlet in a state where the first battery and the second battery are mounted on the vehicle body, wherein the first battery comprises a connector configured to be connected to a second charging device in a state where the first battery is demounted from the vehicle body, and a controller configured to control charging by the second charging device, the second battery comprises a connector configured to be connected to the second charging device in a state where the second battery is demounted from the vehicle body, and a controller configured to control charging by the second charging device, characterised in that one of the first battery and the second battery works as a master battery (20(M)) that communicates with the first charging device, based on information on a state of the one battery and information on a state of the other battery, when being mounted on the vehicle body, and the other of the first battery and the second battery works as a slave battery (20(S)) that sends the information on the state of the other battery to the master battery when being mounted on the vehicle body. a first battery mountable on and demountable from a vehicle body; a second battery mountable on and demountable from the vehicle body independently of the first battery; an electric motor configured to be driven by power from the first battery and the second battery and supply a drive force to a driving wheel ; an inlet provided to or on the vehicle body and configured to be connected to a first charging device installed or provided outside or externally; and a power line (PL) for charging of both of the first battery and the second battery with power supplied via the inlet in a state where the first battery and the second battery are mounted on the vehicle body, wherein the first battery comprises a connector configured to be connected to a second charging device in a state where the first battery is demounted from the vehicle body, and a controller configured to control charging by the second charging device, the second battery comprises a connector configured to be connected to the second charging device in a state where the second battery is demounted from the vehicle body, and a controller configured to control charging by the second charging device, characterised in that one of the first battery and the second battery works as a master battery (20(M)) that communicates with the first charging device, based on information on a state of the one battery and information on a state of the other battery, when being mounted on the vehicle body, and the other of the first battery and the second battery works as a slave battery (20(S)) that sends the information on the state of the other battery to the master battery when being mounted on the vehicle body. <EOS>