A gauging method for a battery discharge-capacity corresponding to a temperature includes steps of detecting a temperature of a battery module of an electronic device according to a predetermined condition; detecting an internal impedance of the battery module and estimating the battery discharge-capacity of the battery module according to the internal impedance if the temperature meets the predetermined condition; and detecting an output current and a voltage of the battery module according to the temperature and calculating the battery discharge-capacity of the battery module according to the temperature, the voltage and the output current if the temperature does not meet the predetermined condition.