AUXILIARY BATTERY SYSTEM OF VEHICLE AND METHOD OF USING THE SAME

An auxiliary battery system of a vehicle and a method of using the same include an auxiliary battery, a switching module, and an auxiliary battery control module, and the auxiliary battery stores power used in a plurality of loads of the vehicle, and configured to provide the power to a first load and a second load among the plurality of loads in a state in which the vehicle is parked, the switching module is electrically connected between the auxiliary battery and the first load, and the auxiliary battery control module is configured to determine whether a vehicle communication network enters a sleep mode in the state where a vehicle is parked, turn on a switching module when it is determined that the vehicle communication network has not entered the sleep mode, and turn off the switching module when a predetermined time period has elapsed after it is determined that the vehicle communication network has entered the sleep mode.