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Top 6 Reasons That Drain Car Battery

Top 6 Reasons That Drain Car Battery
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A dead battery means your car won’t start – making the headlights dim and the engine unresponsive. It can be a real trouble should it drop dead in the middle of nowhere or in a morning when you are already late for work. What does drain car battery? Are you curious about what the reasons might be?

The Reasons That Drain Car Battery

Contrary to popular belief, there are quite a few things that can happen to drain your battery. Read on, and learn about the 6 most common reasons that may suck the juice of your car battery.

Keeping the lights on

It’s a mistake that every driver has made at least once in their lifetime. You have come from work really tired and rushed to the home leaving the headlights on or the trunk open, making the battery to drain overnight.

Even the small dome lights can drain car battery dramatically. So, make sure you haven’t left any lights on before closing the door behind you.

car battery problems
Keeping the headlights on will drain the battery overnight.

Electrical problems

Even if you turn the ignition key off, some functions still keep running. It’s normal for the security alarm, clock, and radio presets to be operational all the time. However, some other components might be switched on if there’s an electrical glitch. For example, the parasitic drain could extend to turning on the trunk and glove box lights, which typically remain off.

The battery is in weak condition.

Poor maintenance can leave a battery in a fragile condition, so it may not retain power for a long time. It will be vulnerable to every condition. Even small drains like the clock or the radio’s memory function can leave it dead. Besides, such a battery doesn’t fare well in extremely hot or cold weather. So, take care of it if you don’t want deal with a dead car in the morning.


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Corroded or loose battery connections.

It’s another consequence of irregular maintenance. Loose or corroded connections won’t let the charging system to work properly. It may drain car battery even when you are driving. Many car models use the alternator to charge radio, clock, lights, and other small components. In that case, a charging issue can make the draining worse. If the battery doesn’t charge up properly, you should have it diagnosed by a professional mechanic.

Drain Car Battery
Corroded car battery connections is another reason of power drain.

Faulty alternator diode

The alternator does the jobs of supplying power to a few electrical systems and recharging the battery. If its diode is corroded, it will cause the circuit to draw power even when the engine is not running.

Old battery

If the car consistently shows the problem of not starting, the problem might be a worn out battery. Typically, car batteries have a lifespan of 4 to 5 years. So, if you often face the drain car battery trouble, it’s probably the time for replacing the battery.

Tsukasa Azuma

Tsukasa Azuma is an awesome car blogger of Car From Japan. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in her sharing posts. Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. Moreover, because of being passionate to learn about the recent happenings in auto industry, he doesn’t only provide great car maintenance tips, he also always updates latest trends in among car brands and share them in his own interesting viewpoint.

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