The first thing you should do is make sure the cars are not touching. If they are, then there's a chance that their batteries may drain and leave you stranded.
The next step is to make sure the cars aren't in gear or in reverse. This can be tricky if your car has a stick shift but generally speaking it shouldn't be too hard to figure out what gear your car is in.
The next step is connecting another red jumper cable between your car’s negative terminal and an unpainted metal on your flat battery-powered car. The next step is to connect your black jump starter to the negative terminal of your car’s battery.
You should not touch either end of these leads while they are connected, as they may cause an electric shock and injury you if you do so. Before you start the engine, make sure that your car's battery pack is not connected. Next, connect the leads to each other and then attach them to the terminals on your battery pack.
AdChoices