How Do You Stop a Car Battery from Draining?

by Phil Borges // in Car

Car batteries are an essential component of any vehicle, providing the necessary power to start the engine and run various electrical systems. However, a common problem that car owners often face is a drained battery. This can be frustrating, especially when you are in a hurry or stranded on the road. In this article, we will discuss some of the common causes of a car battery draining fast and how to prevent it from happening. We will also provide some tips on what to do if your car battery is drained.

What causes a car battery to drain fast?

A car battery can drain quickly due to various reasons. Some of the common reasons include leaving the headlights or interior lights on, a parasitic draw, a bad alternator, a faulty charging system, or an old battery that needs replacement.

How can I find out what is draining my car battery?

Finding out what is draining your car battery can be a bit tricky but not impossible. You can use a multimeter to check the battery’s voltage while the engine is off and the key is out of the ignition. If the voltage is lower than 12.4 volts, it means that something is draining the battery. You can then check each component of the car one by one to find out which one is causing the drain.

How do you keep a car battery from draining?

To keep your car battery from draining, you can follow these simple tips:

  • Turn off all lights and accessories when the engine is off.
  • Unplug any chargers or devices from the car’s power outlets.
  • Check the battery’s water level regularly and refill it if necessary.
  • Drive your car regularly to keep the battery charged.
  • Park your car in a garage or a shaded area to avoid extreme temperatures.

What to do if car battery is drained

If your car battery is drained, you can jump-start it using jumper cables and another vehicle or a jump starter pack. Once the engine is running, let it run for a while to recharge the battery. If the battery keeps draining, you may need to replace it.


Keeping your car battery from draining is important to avoid getting stranded on the road. By following the tips mentioned above, you can extend the life of your car battery and avoid costly replacements. If you suspect that your battery is draining too quickly, don’t hesitate to get it checked by a professional mechanic.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.