Toyota 2013 Prius Owner's Manual page 496

4-3. Do-it-yourself maintenance
STEP 4
Exterior
■
Make sure that the 12-volt battery terminals are not corroded
and that there are no loose connections, cracks, or loose
clamps.
Before charging
■
When charging, the 12-volt battery produces hydrogen gas which is flamma-
ble and explosive. Therefore, observe the following precautions before
charging:
If charging with the 12-volt battery installed on the vehicle, be sure to dis-
●
connect the ground cable.
Make sure the power switch on the charger is off when connecting and
●
disconnecting the charger cables to the 12-volt battery.
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PRIUS PHV_OM_OM47787U_(U)
Remove the 12-volt battery
maintenance cover.
Terminals
Hold-down clamp