Method of determining the identity of a battery pack (62) comprising the steps of discharging a capacitive component (82) of a battery pack circuit of the battery pack; initiating recharging of the capacitive component after the capacitive component is substantially discharged; waiting a predetermined period of time after initiating the recharging of the potential capacitive component; and measuring a voltage output of the battery pack circuit after the predetermined period of time to determine whether the voltage output is above or below a predetermined threshold value.