SMART 2016 fortwo Owner's Manual page 166

Jump-starting
164
Position number A identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
Remove the protective cover from positive terminal :.
X
Connect positive terminal : on your battery to positive terminal ; of donor battery A
X
using the jump lead. beginning with your own battery.
Start the engine of the donor vehicle and run it at idling speed.
X
Connect negative terminal = of donor battery A to negative terminal ? of your battery
X
using the jump lead. Connect the jump lead to donor battery A first.
Start the engine.
X
Before disconnecting the jumper cables, let the engine run for several minutes.
X
First disconnect the jump lead from negative terminal ? and negative terminal = and then
X
from positive terminal : and positive terminal ;. Begin each time at the contacts on your
own vehicle first.
Attach the protective cover to positive terminal :.
X
Have the battery checked at a qualified specialist workshop.
X
i
Jump-starting is not considered to be a normal operating condition.
i
Jumper cables and further information regarding jump starting can be obtained at any
qualified specialist workshop.