is the mode of operation utilized to manage Battery packs
in conventional hybrid vehicles
. State of charge
(SOC) will fluctuate with driving conditions, but a target SOC is usually around 50 to 60 percent. Discharge patterns consist of many shallow discharges which utilize only a portion of the battery pack's chemical energy; a typical range of SOC may be 45% to 75%. A Plug-in hybrid electric vehicle
may initially start operating in a charge-depleting
mode and then default to a charge-sustaining mode after its all-electric range
is exhausted or if the operator neglects to charge it overnight.