Lexus RX450H Manual page 528

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4-3. Do-it-yourself maintenance

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 explo-

For replacement of the 12-volt battery, contact any authorized Lexus dealer

or repairer, or another duly qualified professional.

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.