Lexus RX 450h 2010 Owner's Manual page 496

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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.

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.

4-3. Do-it-yourself maintenance