Toyota PRIUS Manual page 55

Charging (P. 101)
PRIUS PHV_OM_OM47831E_(EE)
1-1. Plug-in hybrid system
In order to drive in EV mode,
charge the hybrid battery (trac-
tion battery) from an external
power source before using your
vehicle.
If there is not enough charge
remaining in the hybrid battery
(traction battery), the EV driving
range will become shorter.
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