If the battery in the car has been discharged then it is possible to "borrow" current from either a separate battery or a battery from another car. Always check that the clamps on the jumper cables are secured firmly so that sparks are not generated.
Facts and advantages
Strong clamps with fully insulated handles
Flexible copper cable 3.5 m, 25 mm²
Approved for all current engine alternatives
Supplied in a plastic bag with carry handle and instructions
0.5 kg (1.1 lbs)
Do not touch the connections during starting attempts. There is a risk that sparks could be generated.