A charging control circuit, wherein the charging control circuit comprises: a charging unit; a plurality of power output ends, respectively configured to connect with a plurality of rechargeable batteries and charge the plurality of rechargeable batteries; a switch unit, wherein the switch unit is connected between the charging unit and the plurality of power output ends; a control unit electrically connected with the switch unit; and a mode switching unit electrically connected with the control unit, wherein the mode switching unit is configured to output a switching signal to control the charging control circuit to switch between a first charging mode and a second charging mode, and wherein the mode switching unit comprises a button, configured to cause the mode switching unit to output the switching signal as a result of a user operating the button; wherein the control unit is configured to switch to the first charging mode or the second charging mode in accordance with the switching signal sent by the mode switching unit, and output a corresponding switch signal to the switch unit; and the switch unit is configured to switch on or switch off electrical connections between the charging unit and the plurality of power output ends in accordance with the switch signal, wherein, when the control unit switches to the first charging mode, the control unit is configured to control the charging unit to, in accordance with an order of battery voltages of the plurality of rechargeable batteries from high to low, sequentially charge the plurality of rechargeable batteries to a first preset value less than a second preset value, and then to charge in parallel, by switching on all the plurality of power output ends, all the rechargeable batteries of the plurality of rechargeable batteries once again and to the second preset value, and wherein, when the control unit switches to the second charging mode, the control unit is configured to control the charging unit to, in accordance with an order of battery voltages of the plurality of rechargeable batteries from high to low, sequentially charge the plurality of rechargeable batteries to the second preset value, wherein the sequentially charging in each of the first and second charging modes includes switching on the power output end which corresponds to the rechargeable battery to be charged, and powering off the other power output ends. a charging unit; a plurality of power output ends, respectively configured to connect with a plurality of rechargeable batteries and charge the plurality of rechargeable batteries; a switch unit, wherein the switch unit is connected between the charging unit and the plurality of power output ends; a control unit electrically connected with the switch unit; and a mode switching unit electrically connected with the control unit, wherein the mode switching unit is configured to output a switching signal to control the charging control circuit to switch between a first charging mode and a second charging mode, and wherein the mode switching unit comprises a button, configured to cause the mode switching unit to output the switching signal as a result of a user operating the button; wherein the control unit is configured to switch to the first charging mode or the second charging mode in accordance with the switching signal sent by the mode switching unit, and output a corresponding switch signal to the switch unit; and the switch unit is configured to switch on or switch off electrical connections between the charging unit and the plurality of power output ends in accordance with the switch signal, wherein, when the control unit switches to the first charging mode, the control unit is configured to control the charging unit to, in accordance with an order of battery voltages of the plurality of rechargeable batteries from high to low, sequentially charge the plurality of rechargeable batteries to a first preset value less than a second preset value, and then to charge in parallel, by switching on all the plurality of power output ends, all the rechargeable batteries of the plurality of rechargeable batteries once again and to the second preset value, and wherein, when the control unit switches to the second charging mode, the control unit is configured to control the charging unit to, in accordance with an order of battery voltages of the plurality of rechargeable batteries from high to low, sequentially charge the plurality of rechargeable batteries to the second preset value, wherein the sequentially charging in each of the first and second charging modes includes switching on the power output end which corresponds to the rechargeable battery to be charged, and powering off the other power output ends.