Lexus LS 600h L 2012 Owner's Manual page 41

1-1. Hybrid system
Charging the hybrid battery (traction battery)
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As the gasoline engine charges the hybrid battery (traction battery), the battery
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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 discharge. For this rea-
son, be sure to drive the vehicle at least once every few 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
Lexus 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" or "S" to avoid discharging the battery.
To help prevent the 12-volt battery from becoming discharged, drive the vehicle
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at least once a month, and operate the accessories only when the "READY"
indicator is on. When parking the vehicle, make sure the doors and trunk are
closed and all lights are turned off.
Charging the 12-volt battery
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→P. 536
After the 12-volt battery has discharged or has been changed or removed
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The gasoline engine may idle at times when it usually would not. The vehicle idles
continuously in order to re-learn the engine operating conditions and this does not
indicate a malfunction. If this continues for more than a few days, contact your Lexus
dealer.
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