Electricity… A field that few master and which seems far too technical for most of us. As soon as we have a problem concerning electronics or electricity, we are generally panicked and we do not feel able to manage it ourselves. Fortunately, some electrical concerns are less important than others. And if you have just changed your replace your battery because the old one was dead, and despite that your new car battery discharges on its own, there is certainly a reason for this and we will help you in this article to find the origin.

To do this, first of all, we will help you identify and understand why the new battery in your vehicle is discharging for no reason. Then, secondly, how to recharge your car battery so that you can enjoy your vehicle in the normal way again.

How to identify that a new car battery is draining on its own?

We therefore directly attack our guide by the part that certainly interests you the most, you will be able to discover why your new car battery is draining. First we will find out how long a new battery lasts without rolling, then how to make sure that it discharges well and that this is not another problem you are facing, and, finally, what are the factors that cause your battery to drain.

why is my new car battery draining?

How long does it take for a new car battery to discharge without driving?

We will start with the basics, you may not know it, but the average lifespan of a car battery is 5 years, this autonomy will fluctuate according to the use that you will have of your vehicle, the temperatures with which it will be confronted, the quality of the battery ... But it must be understood that a battery is a consumable and that with the time it will no longer manage to store the accumulated energy.

To be sure that the fact that the discharge of your battery is abnormal, it is already necessary to integrate that even if you do not ride it will inevitably empty little by little, it is therefore normal that after a certain period of inactivity it is empty, whether it is new or not. It is estimated that on average it is necessary between 2 and 3 months so that it fully discharges. As we told you above, depending on the weather conditions and any electronic equipment on your car, it may be shorter, we recommend run a vehicle at least once every 2 weeks to avoid this kind of worry.

Especially since batteries do not like deep discharges very much, of course, if you discharge it completely, it will have difficulty storing energy again and risk having an impaired autonomy and lifespan.

How can I measure that my battery that I have just changed is discharging for no reason?

New car battery that discharges

When his vehicle does not start most of the time the problem is with the empty battery, however, it can also be related to other electronic or mechanical problems, especially if you have just replaced yours. It is therefore important to ensure that it is responsible for this failure.

Fortunately, it is very simple to measure the voltage of a car battery to see if it is empty or full. All you need is a multimeter or voltmeter, open your hood and locate the battery. Once this is done you need to identify the positive and negative pods. There is usually a “plus” symbol for the positive terminal and a “minus” for the negative, often the positive terminal is also red and the negative black. With the engine off, turn on your multimeter in the volt positions, ideally in the "20 Volts" position and touch the positive terminal with the red electrode and vice versa for the black one. The displayed voltage should be between 12,3 and 13,5 Volts, if it is rather around 10 volts it is discharged or in bad condition.

The main sources of discharging a new car battery

Finally, now that you know how to measure the voltage of your car's battery, we will present to you the different possible causes that cause your battery to discharge for no reason:

  • A defective battery: This does not happen regularly, but batteries are made up of chemicals which can be altered during transport, storage or the like. It is possible that you bought a defective battery, in this case, contact the seller for an exchange.
  • An electric element on: It is a human error that happens much more often than you think, whether it is headlights on, a ceiling light not turned off, the radio running in the background, the causes are various but this will inevitably drain your battery which will not can be recharged only by driving through the alternator, so check all your electrical components
  • A faulty alternator: You just changed your battery thinking that it was dead and was responsible for immobilizing your car, you are certainly right, but sometimes the problem is deeper and it is in fact the alternator which no longer recharges the battery. battery and which therefore deteriorated it due to the fact that it no longer recharges it. Test the voltage of your running engine battery if the alternator is working properly you should see a voltage between 13,5 and 15 Volts. If it is lower (without consumer on) than 13,2 Volts your alternator is certainly tired.
  • A battery wiring problem: The quality of the system of cables that are connected between your battery and the various parts of the vehicle is essential for a good functioning of your electrical part. If some are damaged, or there are bad connections, it may prematurely drain your battery, check the condition of these
  • Too short journeys: It takes a certain time for a battery to be recharged by the alternator, if you only make trips of 5 or 10 minutes it is possible that this is not enough to recharge the latter. Indeed, it is during the starting phase that the engine needs the most energy and therefore will discharge your battery, remember to make trips of more than 15 minutes regularly if this is your case.
  • Extreme temperatures: Finally, as we told you earlier in this article, temperatures strongly impact the lifespan and charge level of a battery, even a new one. It is therefore essential to store your vehicle as well as possible sheltered from cold temperatures or at worst, to remove the battery and store it indoors during severe cold periods in winter.

How to recharge a new car battery that is discharged?

Finally, you should know that even if a battery is discharged it is not necessarily dead, deep discharges will necessarily alter its lifespan without necessarily rendering it directly unusable. With a simple 12 Volt charger that you can find at any automotive center for less than 50 euros. You just need to connect it to an AC outlet and then connect the two clamps to the positive and negative terminals of the battery to be recharged. If despite this, your car does not start with a new battery, do not hesitate to consult our article on this subject.