12-Volt Battery - Lexus ES 300h Owner's Manual

410
6-3. Do-it-yourself maintenance

12-volt battery

Location
The 12-volt battery is located on the
right-hand side of the trunk.
Before recharging
■
When recharging, the 12-volt battery pro-
duces hydrogen gas which is flammable
and explosive. Therefore, observe the fol-
lowing precautions before recharging:
● If recharging with the 12-volt battery
installed on the vehicle, be sure to discon-
nect the ground cable.
Make sure the power switch on the char-
●
ger is off when connecting and discon-
necting the charger cables to the 12-volt
battery.
■ After recharging/reconnecting the 12-
volt battery
Unlocking the doors using the smart
●
entry & start system may not be possible
immediately after reconnecting the 12-
volt battery. If this happens, use the wire-
less remote control or the mechanical
key to lock/unlock the doors.
● Start the hybrid system with the power
switch in ACCESSORY mode. The
hybrid system may not start with the
power switch turned off. However, the
hybrid system will operate normally from
the second attempt.
The power switch mode is recorded by
●
the vehicle. If the 12-volt battery is recon-
nected, the vehicle will return the power
switch mode to the status it was in before
the 12-volt battery was disconnected.
Make sure to turn off the power switch
before disconnect the 12-volt battery.
Take extra care when connecting the 12-
volt battery if the power switch mode
prior to discharge is unknown.
If the hybrid system will not start even after
multiple attempts at all methods above,
contact your Lexus dealer.
WARNING
■ Chemicals in the 12-volt battery
The 12-volt battery contains poisonous
and corrosive sulfuric acid and may pro-
duce hydrogen gas which is flammable
and explosive. To reduce the risk of death
or serious injury, take the following pre-
cautions while working on or near the 12-
volt battery:
● Do not cause sparks by touching the
12-volt battery terminals with tools.
● Do not smoke or light a match near the

12-volt battery.

● Avoid contact with eyes, skin and
clothes.
Never inhale or swallow electrolyte.
●
Wear protective safety glasses when
●
working near the 12-volt battery.
● Keep children away from the 12-volt
battery.
■ Where to safely charge the 12-volt
battery
Always charge the 12-volt battery in an
open area. Do not charge the 12-volt bat-
tery in a garage or closed room where
there is insufficient ventilation.
How to recharge the 12-volt battery
■
Recharge at a current of 5 A or less and
make sure that the recharging period
does not exceed a total of 12 hours.