Lexus RX300 2003 Owner's Manual page 259

D The gas normally produced by a battery will explode
if a flame or spark is brought near.
standardized jumper cables and do not smoke or
light a match while jump starting.
D Warning: Battery posts, terminals and related
accessories contain lead and lead compounds,
chemicals known to the State of California to cause
cancer and reproductive harm. Wash hands after
handling.
NOTICE
The battery used for boosting must be 12 V. Do not jump
start unless you are sure that the booster battery is
correct.
Use only
"
Discharged battery
5
"
Booster battery
6