Car Battery Keeps Dying but Alternator is Good

The engine of our vehicle, like the heart of the human body, is responsible for bringing it to life. But if any of the components that make up the engine fail, the engine will fall like a dry pine tree, just as it did in the beginning.

And the battery is one of those critical components for the proper functioning of the engine. There’s no use for that 700-horsepower Hellcat engine in your high-powered hot rod if the battery that powers it isn’t up to par. A dead battery is like an umbrella in a storm.

Here’s the situation: your car’s battery keeps dying but the alternator is good, right?

A vehicle’s battery won’t survive indefinitely, and if it’s dead, the vehicle won’t be able to run or even start. When a battery is nearing the end of its useful life, there will usually be a plethora of warning signs and indications that, if you pay attention, can help you avoid catastrophic failure. Since vehicle batteries are expensive, it pays to be on the lookout for signs of impending failure so that you can plan for their replacement in good time.

Car Battery Keeps Dying [Symptoms]

1. Faulty Battery

Batteries are constantly being discharged and partially charged, which causes their storage capacity to decrease over time.

The battery should be removed from the vehicle and fully recharged if necessary. By using a contemporary maintenance battery charger, you will also have the option to revive a dead battery on occasion, which is a significant advantage. The charger can also help diagnose a defective battery.

Does the problem still exist after the battery has been fully recharged and tested? Consider whether it is better to replace or recondition the battery.

2. Corroded Connections

The battery and vehicle cables must be properly connected. Damage, corrosion, and loose connections can hinder battery charging. Examine the terminals and cable ends for corrosion and clean them if necessary.

Cleaning can be done with professional cleaners, metal wool, or even sandpaper. To clean the terminals, you can use baking soda or white vinegar.

3. Problem with the Ground Connection

Make sure that all connections are clean and secure. In short, make sure that the terminals and wires are in perfect working order. Should these components become corroded or damaged, power flow will be impeded.

4. Find Parasite Drainers

When electricity continues to drain from the batteries after the truck engine has been shut down, this is called parasitic battery drainage. Battery life is reduced in both the short and long term as a result of this. The more the batteries are charged, the faster their capacity will be depleted. Battery drain, on the other hand, is a problem that, like many other common pitfalls, can be avoided with a little proactive maintenance.

5. Drained Battery

If you don’t drive too often, the battery will drain. Even when the car is not in use, the battery continues to draw power. This small amount of current will eventually drain the battery capacity. The time it takes depends on the condition of the battery.

Another common mistake is to limit driving to short distances. The motor consumes a significant portion of the battery capacity. There is not enough space between the two to fully charge it. Eventually, the battery will run down and the engine will not be able to start.

6. Battery fluid leaks

Consequently, corrosion around the connection posts/bolts is very common and is the source of corrosion. It is recommended to clean the dirt in this situation, but note that this is a symptom of failure, as the battery should not leak or rupture.


What can drain a car battery when the car is off?

Even if your car is turned off, the battery will continue to power electronic devices such as clocks, radios, and alarm systems. These factors should not have a significant influence on your battery. However, when the car battery is off, interior lights, door lights, and even damaged fuses can drain the battery.

Can a bad starter drain a battery?

The battery will discharge if the starter fails. It may absorb an excessive amount of energy or continue to consume energy.

Why is my car battery draining so fast?

A short circuit can cause a high current draw and battery drain. Check for loose or worn alternator belts, circuit faults (loose, disconnected, or broken wires), or faults in the alternator charging system. Excessive use of the battery at start-up can also be caused by engine operating problems.

Why does my car keep dying with a new battery and alternator?

Loose or corroded battery connections, continuous power consumption, charging problems, persistent need for more power than alternators and even inclement weather are some of the most common reasons for recurring automotive battery failures.

How do I know if my battery is bad or my alternator is?

Some of the problems to watch out for are the inability to start and difficulties in starting, the dimming of lights, and difficulties in outputting the sound system. If the vehicle starts but shuts off while driving, the battery may not be able to charge due to a faulty alternator.

Final Thoughts

A bad battery increases the amount of pressure exerted on all vehicle components. Don’t forget that dead batteries are one of the most frequent problems encountered by drivers. It is strongly recommended that you check your vehicle’s battery at least twice a year or with every oil change to avoid unpleasant surprises.

Liam Dare

As CEO of, my passion for the automotive world motivates me to build online businesses that provide information and entertainment to users. I am proud to contribute in a positive way to the automotive community.