Toyota 2012 Avalon Owner's Manual page 396

Battery
Check the battery as follows.
■
Battery exterior
Make sure that the battery terminals are not corroded and that
there are no loose connections, cracks, or loose clamps.
■
Before recharging
When recharging, the battery produces hydrogen gas which is flammable
and explosive. Therefore, before recharging:
●
If recharging with the battery installed on the vehicle, be sure to discon-
nect the ground cable.
●
Make sure the power switch on the charger is off when connecting and
disconnecting the charger cables to the battery.
Terminals
Hold-down clamp
I n f o r ma t i o n P r o v i d e d b y :
4-3. Do-it-yourself maintenance
4
417