Most cars up till recently had only one battery, the purpose was to store energy from the alternator and in turn power the electrical components of the vehicle we mean the lights and the cigarette lighter. Today cars are coming with bigger and better batteries, cars need electric energy just as much as the oil fuel. Today’s cars have electric seats, satellite navigation system, tv's, computers, electric windows; there are also hybrid cars that run on both electric and fuel.
Today’s batteries are almost a hidden component in the vehicle and don't need to be checked or maintained and very rarely fail. Modern vehicles batteries although very rarely fail they can get drained because of the huge amount of load placed by the modern gadgets in our cars. The main culprit being heated seats. Our advice is if your car doesn’t start you could try jump start it. You can jump start a car with battery starter pack, however if you still don’t have any success you will need to visit your garage probably probably for a replacement battery.