Why Is Your Car Battery Draining Fast? | Common Causes

If your car battery is going dead fast, it must be taken care of as soon as possible because it can cause inconvenient breakdowns. Problems like the parasitic drain, faulty alternators, or even just the age of the battery will typically cause a car battery to drain quickly. One example is parasitic battery drain, such as when an electrical component continues to draw power even when the car is off, lights are left on, or devices are plugged in, which can complicate things quickly if not acted upon.

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 How Do You Fix a Car Battery That Drains Fast?

In order to fix a fast-draining car battery, you need first to identify and get rid of the source of the drain. Here are some steps to help:

1. Inspect for Parasitic Drains: Parasitic drains are usually from electrical components that continue to draw power even when the vehicle is off (such as interior lights, stereo systems, or bad relays). You can disconnect the battery, and if it does not show a current flow while the car is off, there is a parasitic drain.
2. Check the Alternator: If the alternator is not working correctly, it may not recharge the battery enough, so it runs down. A multimeter can check the alternator’s output (typically between 13.8 and 14.2 volts).
3. Replace an Old Battery:But if your battery is over three years old, it may be near the end of its life. Car batteries can lose the ability to hold a charge as they age and will drain rapidly.

You may also find this article useful: Common Car Battery Problems

 What Drains a Car Battery When the Car Is Off?

One of the most common reasons to have a car battery drain when it is off is that it suffers from parasitic battery drain. A parasitic drain occurs when the components of your vehicle are drawing small amounts of power while the ignition switch is off. Here are some common causes:

1. Interior and Exterior Lights: Dome or trunk lights, even when left on, will drain the battery. Automatic lights are modern, but if faulty, they can be on, causing a drain.
2. Infotainment or Security Systems: Some infotainment or security systems are constantly powered. Especially some aftermarket systems can be particularly draining.
3. Malfunctioning Relay Switches: Sometimes, a faulty relay switch will maintain power to some components when the car is turned off, causing it to draw power continuously from the battery.

We suggest you also read this article: car battery guide

 Why Is My Car Battery Drained After 3 Days?

If your car battery has been drained after only three days, that is a parasitic or weak battery drain. Here is why this might happen:

1. Continuous Power Although an alarm system or dashboard clock may not draw much power, if it does, it can drain even the battery when the vehicle is parked. Whatever the reason, these constant power draws can quickly kill the battery, and if they are faulty, they can kill it fast.
2. Extreme Temperatures: As you probably know, batteries can quickly lose charge in hot or cold weather. Excessive cold or heat can accelerate battery drain by depleting the electrolyte fluid or increasing the amount of evaporation of the fluids in the battery.
3. Old Battery: The charge-holding capacity of older batteries reduces over time. Even if a draw on your battery is not very large, it may lose charge faster if it is over three years old.

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 How to Prevent Your Battery from Draining

To keep your car battery in good condition and prevent it from draining, consider the following tips:

1.Turn Off All Electronics: Before getting out of the car, make sure all your lights, infotainment system, and accessories are off. Please do not leave chargers or devices in your vehicle while it is off.

2.Limit Short Drives:You might be unable to recharge your battery if you drive short distances fully. If you want to keep your battery charged, then make a habit of occasionally taking longer drives.

3.Regularly Inspect the Battery and Connections: Wrong charging can be due to corrosion or loose connections and fast drainage. Clean the terminals and make sure that the connection is secure.

4.Invest in a Battery Charger: Use a battery maintainer or charger if you only drive sometimes. Such devices help keep these devices fully charged, especially for vehicles that are idle for long periods.

Other recommended articles: 

• Car Battery Life Average 
• Why Is Your Car Battery Light On  

FAQ

1. How come my car battery keeps disappearing quickly?

Your car battery may drain faster because of the old battery, a malfunctioning alternator causing a parasitic drain, or another reason. Early identification can help save you from a dying battery over and over again.

2. Is leaving my car parked for days not enough to drain the battery?

If you have a parasitic drain or a weak battery, yes, especially. The battery may be depleted if it lies long idle periods without a charge.

3. So if my car battery drains quickly, what can I do?

If you can rule out obvious things like lights left on, check battery connections, test the alternator, and try inspecting for the obvious, contact a professional if you still do not need more time.

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