Join Date: Jun 2006
Location: SoCal, USA
Vehicle: SLK55 2006 widebody
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Yes, the most damage would come from using your SLK to charge another car, since that starter and battery is pumping back into your car. Furthermore, NEVER EVER connect two cars that are running (i.e. start the working car, then start the other car while the first is running). I have very personally seen that blow several fuses and relays.
The safest way to jump start, if absolutely neccesary, is to disconnect the other car from its battery, connect the positives to each other, and hook that battery's negative to your ground. This effectively gives you the average of the voltage of the 2 batteries, but an increase in amps. Wait a couple minutes, start your car, and then immediately disconnect the other battery. avoid multiple contacts (lot's of sparking) as that's when the voltages are spiking.
No matter what, you should use a trickle charger if possible.
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