Car Battery Loses Charge Overnight- Causes and Methods

Having a car battery that drains overnight is a very frustrating thing. Things get really bad when you have something important to deal with in the morning, but you wake up to a car with a dead or drained battery that won’t start the car. Although the issue is very bad and even worse in the case of automatic transmission cars, the issue can be easily resolved when you know the root of the cause.

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Why does your car battery keep dying overnight?

Whenever you are traversing to solve some problem, the best is to start from the root of the issue. In this way, you can easily get to know the faulty component. Speaking of the car batteries they can die overnight even when you installed a fully charged battery in the car.

What makes things complex is that there are several causes for this issue, and you usually do not know which one you are facing. So, here are some of the reasons that your car battery keeps dying overnight.

Humanly Mistake

It is a common mistake that sometimes we are very tired when we reach home. Although people do everything, one thing that is usually forgotten is the parking lights of the car or the internal light of the car. If any of those are left powered on for the whole night, they can easily drain the car battery overnight. However, if it is not the issue in your case then you can proceed to the other reasons.

A Faulty Battery

The first and the easiest solution to this issue is to check the car battery. The batteries of cars do not come to serve you for a lifetime and after they have served their purpose their internals start to lose power. In that case, the battery can lose charge overnight.

Faulty Electronics of the Battery

There are some electronics in the car that are always connected to the battery. These usually include the infotainment system of the car, clock, and locking system. If there is any type of issue with any of those which causes them to drain more power than usual, then the battery can easily drain out overnight.

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How do you stop your car battery from draining overnight?

Having a car battery that once drained but you charged it and the issue never happened again is not a big deal. However, when the issue persists and happens regularly then you need to take some action. The worst case is when the issue happens daily.

As there are several reasons for the car battery draining overnight, there are several solutions to the problem as well. So, the following are some of the most effective solutions to the overnight draining battery.

Replacing the Battery

The first and the easiest solution of all is to get the battery of your car replaced. Sometimes the issue lies within the battery as it has served for its life. If that is the case, then replacing the battery of your car will get the issue resolved.

However, before you do the process, it would be better to test if the issue lies within the battery or not. If you have a working battery, then replacing it can also damage the new battery. The reason here is that the issue lies in the car instead of the battery

Getting the Alternator Checked

So, if the issue lies within the car, the most suspicious thing will be the alternator of the car. It is a component that has the job to charge the car battery. However, when it fails to serve the battery is only being used and not being charged. A common way to solve the issue is by getting the alternator tested and if there is an issue then replacing it.

How do you find out what is draining your car battery?

Finding out the root cause is the most important thing as if you keep replacing the battery or getting the alternator checked without solving the root then it could be problematic. So, it is necessary to check what is draining your car battery. There are several things that you need to check.

Checking the Computer and Electronics of the Car

The first thing that you need to get checked is the computer and electronic system of the car. There could be a little malfunction that may be causing the drainage of your car’s battery. Sometimes things like short circuits also are a major reason for the car battery draining overnight. So, it is the first thing that needs checking.

Checking the Multimedia System of the Car

So, you got the computer of the car checked and there was no issue. Now is the part where you need to get the multimedia system of the car checked. It is also connected with the battery even when the car is turned off.

It is necessary to keep connected for things like location services, time, multimedia setup, and a lot more. So, you can check if this system is draining more than the rated power. If it is so, then it is the main issue with the car.

Checking the Security System of the Car

The last thing left to check in the car is the security system of the car. It is also connected with the battery all the time for smart locking and unlocking of the car. Some cars also have a tracker installed and that uses the battery as well.

What you need to check is their power usage is more than the rated usage. If it is so, then the locking or tracking system of the car is causing all of the issues with the battery.

Conclusion

While you can start the manual cars without their battery being good by pushing the car, the same is not possible with automatic transmission cars. So, what you need to make sure of is the good health of the battery. In any case, if there is an issue with the car battery you must track it down to the root cause rather than simply replacing the battery.