Provided is a battery pack and a power system including the same. The battery pack includes a battery module having a positive electrode terminal and a negative electrode terminal, a first connector having a first power terminal connected to the positive electrode terminal, a second power terminal connected to the negative electrode terminal and a first auxiliary terminal, a first resistor having a first end electrically connected to ground and a second end electrically connected to the first auxiliary terminal, a switching unit installed between the negative electrode terminal and the second power terminal, and a control unit. The control unit is configured to operate in any one of a wakeup state and a sleep state according to a voltage of the first resistor.