A cleaner comprising: a cleaner body ; a power supply comprising a first battery and a second battery that are accommodated in the cleaner body , and a power supply circuit configured to operate in a charge mode for receiving power from an outside to recharge the first and second batteries or in a discharge mode for supplying the power recharged in the first and second batteries to a load; a charging terminal connected to an external charging stand and configured to supply direct current (DC) power recharged in the first and second batteries to the power supply ; and a controller configured to control an operation of the power supply , wherein the power supply circuit comprises: a main switching unit configured to be switched to connect the first and second batteries in a series to each other in the discharge mode and to connect the first and second batteries in parallel to each other in the charge mode; a first switching unit configured to be turned on in the charge mode and to supply the DC power to the first battery ; and a second switching unit configured to be turned on in the charge mode and to supply the DC power to the second battery ; wherein the main switching unit is configured to be mechanically pressed to be switched or is configured to be switched under control of the controller when the charging terminal disposed on a bottom surface of the cleaner body is connected to the charging stand . a cleaner body ; a power supply comprising a first battery and a second battery that are accommodated in the cleaner body , and a power supply circuit configured to operate in a charge mode for receiving power from an outside to recharge the first and second batteries or in a discharge mode for supplying the power recharged in the first and second batteries to a load; a charging terminal connected to an external charging stand and configured to supply direct current (DC) power recharged in the first and second batteries to the power supply ; and a controller configured to control an operation of the power supply , wherein the power supply circuit comprises: a main switching unit configured to be switched to connect the first and second batteries in a series to each other in the discharge mode and to connect the first and second batteries in parallel to each other in the charge mode; a first switching unit configured to be turned on in the charge mode and to supply the DC power to the first battery ; and a second switching unit configured to be turned on in the charge mode and to supply the DC power to the second battery ; wherein the main switching unit is configured to be mechanically pressed to be switched or is configured to be switched under control of the controller when the charging terminal disposed on a bottom surface of the cleaner body is connected to the charging stand . a main switching unit configured to be switched to connect the first and second batteries in a series to each other in the discharge mode and to connect the first and second batteries in parallel to each other in the charge mode; a first switching unit configured to be turned on in the charge mode and to supply the DC power to the first battery ; and a second switching unit configured to be turned on in the charge mode and to supply the DC power to the second battery ; wherein the main switching unit is configured to be mechanically pressed to be switched or is configured to be switched under control of the controller when the charging terminal disposed on a bottom surface of the cleaner body is connected to the charging stand . <EOS>