SMART roadster Operating Instructions Manual page 225

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Battery
Removing the jumper cables
Do not switch on electrical consumers
such as the blower or the rear window
heater until the engine is running.
Do not switch the lights on!
> This helps reduce the danger of any
sparking when removing the jumper
cables.
Start by removing the jumper cable
connected to the negative terminal,
then remove the cable connected to the
positive terminal.
10 30 Helpful hints
Things you need to know
Only use batteries with identically
rated voltages (12 volt).
Use jumper cables of a suitable cross
section and insulated cable clamps;
these are available from a qualified
workshop, such as a smart center.
The vehicles must not touch each other
during starting attempts.
Switch off electrical consumers in
both vehicles.
Switch off the engine of the second
vehicle.