SMART roadster Operating Instructions Manual page 221

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Battery
Danger of injury!
If the positive terminal of the
connected battery is allowed to make
contact with vehicle components, there
could be a short circuit which could
ignite the highly explosive gas
mixture generated by the battery. You
and others could sustain serious
injuries as a result.
When disconnecting the battery,
always disconnect first the negative
terminal, then the positive terminal.
When connecting the battery, always
connect first the positive terminal,
then the negative terminal.
Do not loosen or disconnect the
battery terminal clips while the
engine is running.
10 26 Helpful hints
Environment!
Batteries contain lead and
sulphuric acid, and should not be
disposed of as domestic waste!
Hand any spent, faulty or damaged
batteries in to a qualified specialist
workshop, e.g. a smart center, or to a
collection point for spent batteries.
Your car's battery
Models with a petrol engine:
12 volt and 42 ampere hours.
Model with petrol engine (cold zone):
12 volts and 61 ampere hours.