As soon as you start your car your alternator begins charging the battery. As you increase the speed of the engine, (the revs), the charge going to the battery increases. The charge to the battery increases even more when the car is driven over longer distances. In the event that the battery is low on charge and holding less than half of it’s capacity, there will most likely be issues getting the battery to remain charged even after you drive the car for a long time. If you notice that the car becomes harder to start you will need to get a battery load tester. Either a load tester or a multi meter connected to the lead battery posts will tell you the amount of charge going to the battery. Perhaps you may need to contact batterymangoldcoast.com.au to come and test your battery for you.