SMART forfour Operating Instructions Manual page 223

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Battery
Charging the battery
Danger of explosion!
While the battery is being
charged, the oxyhydrogen gas generat
ed by the battery represents an explo
sion risk. Avoid causing sparks. Do not
use any naked flames or smoke within
the vicinity of the battery. Do not touch
the battery terminal with metal objects
and do not remove the battery charger's
terminal clamps until the battery
charger has been switched off and no
further gas is being discharged by the
batteries. Charge the battery in a well
ventilated area. Do not lean over the
battery during charging, and do not
breathe in the gases. You are otherwise
at risk of injury.
9 20 Helpful hints
Only use chargers of a correct or suit
able voltage.
Never attempt to recharge a frozen bat
tery. Have the battery checked by a
qualified specialist workshop, e.g. a
smart center. The housing could be
damaged.
>Note!
Disconnect the battery for rapid charg
ing prior to using the charger.