A balancing apparatus, comprising: a voltage regulator configured to selectively generate a first high level voltage from a voltage of an auxiliary battery; a balancing unit including a plurality of balancing circuits, the plurality of balancing circuits being connected in parallel to a plurality of battery cells included in a battery group, respectively; and a control unit including a power terminal (P P), a hold terminal (P H) and a plurality of balancing terminals (P B), and the plurality of balancing terminals being electrically connected to the plurality of balancing circuits, respectively, characterized in that it further comprises: a power switch including a first current terminal, a second current terminal and a control terminal, the first current terminal being electrically connected to a high voltage node of the battery group; a DC-DC converter including a voltage input terminal electrically connected to the power terminal, and a voltage output terminal, the DC-DC converter being configured to generate a second high level voltage from a voltage applied to the voltage input terminal and output the second high level voltage to the voltage output terminal, and the voltage input terminal being electrically connected to the second current terminal; wherein the hold terminal is electrically connected to the control terminal; wherein the control unit is configured to hold the first high level voltage through the hold terminal in response to the second high level voltage being applied to the power terminal; wherein the control unit further includes a hold capacitor (C H) connected between the hold terminal and ground; wherein the control unit further includes a hold switch (SW H) connected in parallel to the hold capacitor, and the control unit is configured to control the hold switch to an OFF-state in response to the second high level voltage being applied to the power terminal. a voltage regulator configured to selectively generate a first high level voltage from a voltage of an auxiliary battery; a balancing unit including a plurality of balancing circuits, the plurality of balancing circuits being connected in parallel to a plurality of battery cells included in a battery group, respectively; and a control unit including a power terminal (P P), a hold terminal (P H) and a plurality of balancing terminals (P B), and the plurality of balancing terminals being electrically connected to the plurality of balancing circuits, respectively, characterized in that it further comprises: a power switch including a first current terminal, a second current terminal and a control terminal, the first current terminal being electrically connected to a high voltage node of the battery group; a DC-DC converter including a voltage input terminal electrically connected to the power terminal, and a voltage output terminal, the DC-DC converter being configured to generate a second high level voltage from a voltage applied to the voltage input terminal and output the second high level voltage to the voltage output terminal, and the voltage input terminal being electrically connected to the second current terminal; wherein the hold terminal is electrically connected to the control terminal; wherein the control unit is configured to hold the first high level voltage through the hold terminal in response to the second high level voltage being applied to the power terminal; wherein the control unit further includes a hold capacitor (C H) connected between the hold terminal and ground; wherein the control unit further includes a hold switch (SW H) connected in parallel to the hold capacitor, and the control unit is configured to control the hold switch to an OFF-state in response to the second high level voltage being applied to the power terminal. a power switch including a first current terminal, a second current terminal and a control terminal, the first current terminal being electrically connected to a high voltage node of the battery group; a DC-DC converter including a voltage input terminal electrically connected to the power terminal, and a voltage output terminal, the DC-DC converter being configured to generate a second high level voltage from a voltage applied to the voltage input terminal and output the second high level voltage to the voltage output terminal, and the voltage input terminal being electrically connected to the second current terminal; wherein the hold terminal is electrically connected to the control terminal; wherein the control unit is configured to hold the first high level voltage through the hold terminal in response to the second high level voltage being applied to the power terminal; wherein the control unit further includes a hold capacitor (C H) connected between the hold terminal and ground; wherein the control unit further includes a hold switch (SW H) connected in parallel to the hold capacitor, and the control unit is configured to control the hold switch to an OFF-state in response to the second high level voltage being applied to the power terminal.