Toyota Camry 2014 Manual page 473

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Charging the 12-volt battery
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 appliances. 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 oper-
ating.)
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Precautions when the 12-volt battery is discharged
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In some cases, it may not be possible to unlock the doors using the smart
key system when the battery is discharged. Use the wireless remote con-
trol or the mechanical key to lock or unlock the doors.
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The hybrid system may not start on the first attempt after the 12-volt bat-
tery has recharged but will start normally after the second attempt. This is
not a malfunction.
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The "POWER" switch mode is memorized by the vehicle. When the 12-
volt battery is 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 discharged, be especially careful when reconnecting the 12-
volt battery.
CAUTION
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Avoiding 12-volt battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flam-
mable gas that may be emitted from the 12-volt battery:
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Make sure each jumper cable is connected to the correct terminal and that
it is not unintentionally in contact with any other than the intended terminal.
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Do not allow the + and - clamps of the jumper cables to come into contact
with each other.
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Do not smoke, use matches, cigarette lighters or allow open flame near
the 12-volt battery.
5-2. Steps to take in an emergency
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