Look at this poor and sad car. It can't start because its battery is dead, nearly dead. So, what shall we do? Lets look at the first step.
(Thank to papertoys.com for the paper cars in this instructable and crazyscientist_11 on Flickr for his photo of the engine bay, I used with his agreement.)
Step 1: What you need:
a car with a low battery to jump start
a booster car (to jump start from)
instead of a booster car you can get a booster pack like the one on the picture beneath, which contents also a light you can use in the dark (very useful).
a pal to help (not needed but also useful and in the most cases attached to the provided booster car)