Why does my car battery die when it rains?

Why does my car battery die when it rains?

Have you ever been in a situation where you were driving your car in the rain, parked it in your garage, and then when you tried to start it again, it just wouldn’t work? If it’s not a familiar situation, you can get panicked and ask why does my car battery die when it rains.

There are a few reasons why your battery might not work. One of the reasons is that your battery might be old and can’t perform as it used to, or else the battery is corroded because of moisture inside.

After reading this article, you can understand what leads to battery death, what precautions to avoid sudden battery death, and what you can do if your car is facing such difficulties. 

Keep reading so that you can avoid these kinds of situations.

Can a car battery die when it rains?

Usually, rain does not cause the battery to die. Rain isn’t responsible for total battery drain.

When it rains, the humidity level gets high. It may cause corrosion to form at the battery connection. But it rarely damages battery function. If you are facing any difficulties that indicate battery drain, you can check other possibilities that can cause battery failure.

There are many reasons why you might experience battery failure. Such as issues when starting a car or the sudden shutdown of a car engine. One of these factors is cold weather, especially during rainy days. The situation is similar to the cold and windy conditions experienced in many countries during winter. Cold temperatures can weaken a battery, making it more exposed to failure.

The car batteries die due to ice-cold temperatures. Because cold temperature affects the specific gravity of the electrolyte contained in the battery case, if you have a poorly sealed engine compartment, this will allow water to enter the top of the battery and form a wet short circuit across the battery posts. It will slightly drain the power of the battery. But if the water remains there for a long time, it might cause heavy damage to the battery.

Is rain good for your car battery? 

Sometimes batteries absorb too much heat, which is harmful to your car. It declines the battery performance, and even it can start a fire. To prevent these types of problem car has a cooling ac for its battery.

Rainy season can be a natural cooler for your car, ensuring that your car does not get too warm. Heat and moisture can damage your car’s lifetime. Still, we will advise you to park your car in an insulated and dry place to prevent any kind of damage and harm.

What to do when your car battery dies in Rain

As we mentioned above, that car battery doesn’t die in rain. The culprit causing this might be something else. Here are some possible reasons that might happen to your car.

  1. Wet or fouled spark plugs: If spark plugs become wet due to rain, they won’t be able to produce a spark effectively. As a result, the engine may misfire, run rough, or might come to a full stop.
  2.  Water in the distributor cap: The distributor cap is a part of the ignition system responsible for distributing electricity from the ignition coil to each spark plug. If water or moisture gets into the distributor cap due to rain, it can disrupt the electrical flow and prevent the spark plugs from firing properly, which can lead the engine to misfire and stall.
  3.  Faulty ignition system: A malfunctioning ignition system, including components like the ignition coil, ignition module, or spark plug wires, can cause issues with spark plug performance and lead to stop your vehicle and make the vehicle stop.
  4.  Bad fuel pump: The fuel pump is responsible for delivering fuel from the tank to the engine. If the fuel pump connection is wet and doesn’t work, it fails or becomes faulty, and the engine may not receive enough fuel, leading to misfires and, eventually, a complete stop.

If you face this problem, you can primarily check your vehicle and see which part is having issues.

After inspecting, if you can’t find a solution, its best you call a tow truck and tow your car to the nearest car repair shop

What type of problem can you face due to heavy rain?

Rain does not create direct harm that can cause your batter to die. But it can certainly generate a lot of problems for your can that create an image that your can battery is damaged.

Decrease of speed

Decrease of speed

Heavy rains often cause the car engine to slow down. Even it can happen when you are on highways. In highways, you need a proper speed to keep up with other vehicles. Rain also causes poor visibility, which further becomes a reason for lousy speed.

The engine revolutions needed for full charging system function are not achieved when inching along for extended periods. However, modern automobiles have a better charging system and produce maximum alternator power. The battery can also be sat down because of cold weather during rain. 

Accessories to the Crime

Accessories to the Crime

At low speeds, the alternator struggles to keep the energy flowing to the ignition system and fuel pump. For this, further battery reserves are stolen by the accessories used in inclement weather. Cold weather is an unfriendly situation for a vehicle. Car batteries face challenges in serving power for the extensive case.

At this time, the car needs an extra power supply. This can be extra pressure for a car. Pressure can eventually damage your car battery condition.

Slip Sliding Away

Slip Sliding Away

Rainy water can make car tires wet. When the tires are wet, car tires lose traction. It is also true for the rubber belts that drive alternators. The squeal that typically accompanies belt slip may not occur when the pulleys and belts are wet.

On the other hand, we won’t face these types of problems in wet weather. But the cool temperature can aggravate the situation.

To prevent unwanted these types of situations, you can take some precautions. 

  • Never park your car in any open place during the rainy season. Water can enter the car engine or even into the battery. This may further cause battery death.
  •  If you have any leakage in your car operating system, you must be more careful as water can enter so quickly. 
  • Too much cold weather can decrease battery temperature. This will cause disturbance while starting your car. It will take more time to start as I will first take some energy to get proper heat.
  •  If water enters your car, go to a mechanic’s store and eliminate this situation. Otherwise, it can hamper your car’s danger. 

Another problem that can cause your battery programme badly and you can face problems that indicate battery death. Not all time, you face problems because of total battery failure. Some other reasons can be behind these. 

Out of fuel

Out of fuel

The most common reason for which you feel like your battery died is actually that your car ran out of fuel. This can happen to any of us. Fuel gives energy to the car and maintains the whole process of the car’s function.

To prevent running out of fuel, you need to notice the slight buzzing sound while starting your car. Regularly checking your fuel quantity can avoid this type of unwanted incident. 

Alternator Problems

 Alternator Problems

The battery of your car can run off even when the alternator has some issues. You must note your car’s additional electronic supply and battery energy level regularly. This is very crucial for the electrical systems of your vehicle. Even you can understand when your car needs a new battery replacement by checking regularly. 

An alternator must work correctly to maintain the car. If you see a red battery light flickering on the dashboard, it means that the alternator is sending an S.O.S. You must stop your car immediately and visit an auto-repairing service provider to fix the problem.

Problematic Ignition Switch

 Problematic Ignition Switch

Ignition switches maintain starting of a car and access to the radio and other appliances. If your ignition switch is problematic, then you will have issues while starting your car and many other. It happens as a worn-down ignition switch can cause a loss of power to the engine. It is the power loss that can make the car die while driving.

Something is Faulty In the Fuel Pump

 Something is Faulty In the Fuel Pump

Another reason that can make a car stop is something wrong with the fuel pump. For this, it is essential to be careful while using your car fuel. If by any chance you happen to pump petrol into diesel cars or diesel into petrol cars, you may face this problem. It will lead to unwanted car failures. There has another reason for this problem. Suppose something is blocking the filter or the fuel pump. You need to check your car regularly. Another sign that you are having this problem is that you can hear a slight buzzing sound while starting your vehicle.

Malfunctioning Sensors

 Malfunctioning Sensors

 Sensors can detect both physical and chemical changes in the car. If sensors fail, it will give defaulted information. It will impact the performance and efficiency of the vehicle.

Obviously, a faulty battery is the main reason behind your car system damage. But not importantly, rain caused your battery damage. Just with some precaution and proper maintenance, you can have an excellent battery system for your favourite car.

Is It Safe to Pour Hot Water on a Car Battery

As we know, car batteries gets sat down in cold temperature. So you might think of pouring hot water into the battery, which is a bad idea. Car batteries hold some lead and acid in them, so when you pour hot water in them, the lead and acid can form a lethal reaction as the reaction can create fire and spread toxic fumes.
In more terrific ways, it can create explosions and damage the engine compartment.n Sp it is restricted to put hot water in your battery.


When your vehicle’s electrical system isn’t responding and when you check, the battery isn’t working so you may get frustrated and ask

As we said earlier, rain can’t cause the battery to die. There are some other reasons why your vehicle’s battery might die. If you can’t figure out the problem, call for professional help because some other components might be at fault. So the best advice should be to leave it to the professionals.

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