Lexus GS450h Owner's Manual page 533

Starting the hybrid system when the 12-volt battery is discharged
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The hybrid system cannot be started by push-starting.
To prevent 12-volt battery discharge
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Turn off the headlights and the audio system while the hybrid system is off.
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Turn off any unnecessary electrical components when the vehicle is running at a low
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speed for an extended period, such as in heavy traffic.
Charging the 12-volt battery
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The electricity stored in the 12-volt battery will discharge gradually even when the vehicle
is not in use, due to natural discharge and the draining effects of certain electrical appli-
ances. If the vehicle is left for a long time, the 12-volt battery may discharge, and the
hybrid system may be unable to start. (The 12-volt battery recharges automatically while
the hybrid system is operating.)
When recharging or replacing the 12-volt battery
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In some cases, it may not be possible to unlock the doors using the smart entry & start
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system when the 12-volt battery is discharged. Use the wireless remote control or the
mechanical key to lock or unlock the doors.
The hybrid system may not start on the first attempt after the 12-volt battery has
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recharged but will start normally after the second attempt. This is not a malfunction.
The power switch mode is memorized by the vehicle. When the 12-volt battery is
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reconnected, the system will return to the mode it was in before the 12-volt battery was
discharged. Before disconnecting the 12-volt battery, turn the power switch off.
If you are unsure what mode the power switch was in before the 12-volt battery dis-
charged, be especially careful when reconnecting the 12-volt battery.
WARNING
Avoiding 12-volt battery fires or explosions
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Observe the following precautions to prevent accidentally igniting the flammable gas
that may be emitted from the 12-volt battery:
Make sure each jumper cable is connected to the correct terminal and that it is not
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unintentionally in contact with any other than the intended terminal.
Do not allow the other end of the jumper cable connected to the "+" terminal to come
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into contact with any other parts or metal surfaces in the area, such as brackets or
unpainted metal.
Do not allow the + and - clamps of the jumper cables to come into contact with each
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other.
Do not smoke, use matches, cigarette lighters or allow open flame near the 12-volt
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battery.
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7-2. Steps to take in an emergency
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