It is safer to connect it to an earthing point under the engine bay. The latest advice is to NOT connect the negative lead to the negative battery terminal of the old battery as this creates a fire risk.Connect the negative (black) lead to the negative (-) terminal on the working battery.Connect the other end of the positive lead to the positive terminal on the dead battery.Connect the positive, or live (red) jump lead to the working battery's positive (+, or red) terminal.First off, ensure both cars are off with handbrakes on, and parked closely together.'How to jump-start a car with leads?' can be explained in ten easy steps: Jump packs used to be relatively unwieldy devices, but lithium-ion technology means they are now highly portable. Jump packs are portable batteries that you can charge at home and then hook up to your car battery to get its engine spinning. Your second option is to use the car salesperson's friend – the jump pack. The downside of this system is you need another healthy car and someone with the time and will to help you out – not things you can always guarantee to find. Once the engine's sparked – and assuming there's nothing else wrong (like a faulty alternator) – from there the car can charge its own battery. Essentially, you're sending the power from a healthy car with a charged battery to the other car with a flat battery – the slug of electricity is enough to crank the sick car's engine and, with a few turns, it spins into life. Thirty years ago it was common to see two cars with their bonnets open, with a pair of cables connecting their batteries – this was jump-starting.
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