TOYOTA 2011 Prius - Manual (Page 475)

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4-3. Do-it-yourself maintenance
PRIUS_U (OM47685U) DVD
CAUTION
n When disconnecting the 12 volt battery
n When replacing the 12 volt battery
Use a 12 volt battery designed for the vehicle. Failure to do so may cause
gas (hydrogen) to enter the passenger compartment, causing a fire or explo-
sion.
For replacement of the 12 volt battery, contact your Toyota dealer.
NOTICE
n 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.
Do not disconnect the negative (-) termi-
nal on the body side as shown. The dis-
connected negative (-) terminal may
touch the positive (+) terminal, which may
cause a short and result in death or seri-
ous injury.