Toyota PRIUS 2008 Manual page 24

1-1. Hybrid system
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Charging the battery
As the gasoline engine charges the hybrid battery (traction battery), the
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battery does not need to be charged from an outside source. However, if
the vehicle is left parked for a long time the hybrid battery will slowly dis-
charge. For this reason, be sure to drive the vehicle at least once every
several months for at least 30 minutes or 10 miles (16 km). If the hybrid
battery becomes fully discharged and you are unable to jump-start the
vehicle with the 12 volt battery, contact your Toyota dealer.
If the shift lever is in "N", the hybrid battery (traction battery) will not be
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charged. When driving in heavy traffic, operate the vehicle with the shift
lever in "D" to avoid discharging the battery.
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After the 12 volt battery has discharged or has been changed or
removed
The gasoline engine may not stop even if the vehicle is running on the hybrid
battery (traction battery). If this continues for a few days, contact your Toyota
dealer.
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