Ford 2002 Think Owner's Manual page 72

Charging
After properly connecting the vehicle to the
receptacle, the charger will initiate a four stage
charging process. In the first stage, the battery is
tested. Further charging is prohibited if the charger
discovers a fault. If the battery passes, the charger
determines the appropriate charging rate, depending
upon the voltage of the battery pack, and charges
the battery pack. In the second and third stages, the
voltage is regulated, and charging is completed. The
battery is maintained at the full state of charge in
the fourth stage. If the vehicle is left on, the charger
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