A battery or a generator failure causes a car to be difficult or impossible to acquire. If the startup problems occur after a long outage, you need to charge the battery with a charger. If the vehicle is regularly operated and a low-charge lamp is lit, the generator is most likely to be failing the generator or the tension of the alternator is reduced.
Another possible reason for the low battery charge is that with the engine shut off, too many current-current consumers-the magnet, the headlights, etc.