TOYOTA 2010 Prius - Manual (Page 463)

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4-3. Do-it-yourself maintenance
CAUTION
■
When disconnecting the 12 volt battery
NOTICE
■
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.