When a jump start helps
If the lights are weak or you hear clicking when you turn the key, the 12 V battery is often empty. A jump start gets you going. If the car dies again quickly, the battery or charging system needs a garage.
Electric cars
The 12 V battery in an EV can also go flat (locks and electronics). We can jump-start that. If the high-voltage pack is empty, the car must go on a flatbed to a charge point or dealer.