Lexus LS 600h L 2012 Owner's Manual page 458

CAUTION
When replacing the 12-volt battery
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Use a 12-volt battery designed for the LS600hL. 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
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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
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