TOYOTA 2011 Prius - Manual (Page 472)

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4-3. Do-it-yourself maintenance
4
Mai
n
tenan
ce and care
PRIUS_U (OM47685U) DVD
n Before recharging
When recharging, the 12 volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, before recharging:
l If recharging with the 12 volt battery installed on the vehicle, be sure to
disconnect the ground cable.
l Make sure the power switch on the charger is off when connecting and
disconnecting the charger cables to the 12 volt battery.
n 12 volt battery exterior
Make sure that the 12 volt battery terminals are not corroded
and that there are no loose connections, cracks, or loose
clamps.
Terminals
Hold-down clamp