Toyota 2014 Prius Owner's Manual page 385

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Make sure that the 12-volt battery terminals are not corroded

and that there are no loose connections, cracks, or loose

Before recharging

When recharging, the 12-volt battery produces hydrogen gas which is flam-

mable and explosive. Therefore, observe the following precautions before

If recharging with the 12-volt battery installed on the vehicle, be sure to

disconnect 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.

PRIUS v_OM_OM47840U_(U)

4-3. Do-it-yourself maintenance

Hold-down clamp