Location

The 12-volt battery is located on the left-hand side of the luggage compartment.

Removing the 12-volt battery cover

- Vehicles with a compact spare tire

Pull the lever upward to fold back the front part of the deck board.

Pull the folded deck board upright.

Pull on the attached hook to extend the string.

Use the hook to secure the deck board as shown in the illustration.

After removing the clips, remove the 12-volt battery cover.

- Vehicles with a full-size spare tire

Pull the lever upward to fold back the front part of the deck board.

Pull on the attached hook to extend the string.

Use the hook to secure the deck board as shown in the illustration.

After removing the clips, remove the 12-volt battery cover.

Exterior

Make sure that the 12-volt battery terminals are not corroded and that there are no loose connections, cracks or loose clamps.

1. Terminals.

2. Hold-down clamp.

Installing the 12-volt battery cover

Install the 12-volt battery cover with the clips.

Before recharging

When recharging, the 12-volt battery produces hydrogen gas which is flammable and explosive. Therefore, observe the following precautions before recharging: If recharging with the 12-volt battery installed on the vehicle, be sure to disconnect
the ground cable.

Make sure the power switch on the charger is off when connecting and disconnecting
the charger cables to the 12-volt battery.

After recharging/reconnecting the 12-volt battery

The hybrid system may not start. Follow one or both of the following procedures:
After opening and closing the driver’s door, wait 10 seconds and then attempt to
start the hybrid system. (If the system does not start the first time, repeat the procedure.)
With the shift lever in P and the “POWER” switch off, open and close any door and then attempt to start the hybrid system.

If the system will not start even after multiple attempts at both methods, contact
your Lexus dealer.

CAUTION:
Chemicals in the 12-volt battery The 12-volt battery contain poisonous and corrosive sulfuric acid and may produce
hydrogen gas which is flammable and explosive. To reduce the risk of death or serious
injury, take the following precautions 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 battery
in a garage or closed room where there is insufficient ventilation.

How to recharge the 12-volt battery Only perform a slow charge (5 A or less). The 12-volt battery may explode if charged at a quicker rate.

Emergency measures regarding electrolyte If electrolyte gets in your eyes.

Flush your eyes with clean water for at least 15 minutes and get immediate medical
attention. If possible, continue to apply water with a sponge or cloth while traveling to the nearest medical facility.

If electrolyte gets on your skin.

Wash the affected area thoroughly. If you feel pain or burning, get medical attention
immediately.

If electrolyte gets on your clothes.

It can soak through clothing on to your skin. Immediately take off the clothing and
follow the procedure above if necessary.

If you accidentally swallow electrolyte Drink a large quantity of water or milk. Follow with milk of magnesia, beaten raw
egg or vegetable oil. Get emergency medical attention immediately.

CAUTION:
When replacing the 12-volt battery Use a 12-volt battery designed for the RX450h. Failure to do so may cause gas (hydrogen) to enter the passenger compartment, causing a fire or explosion.

For replacement of the 12-volt battery, contact your Lexus dealer.

NOTICE:
When recharging the 12-volt battery Never recharge the 12-volt battery while the hybrid system is operating. Also, be
sure all accessories are turned off.