Skip the auto shop - Our mechanics make house calls

Q: Battery keeps getting drained while the car is off during the night

asked by on

I have a problem with the battery in my car, for which I went to several shops but they couldn't solve the problem. Each night I park the car and in the morning when I try to start it, I find the battery drained. Every single night. It goes from 12V to 5V. Something is obviously keeping the battery drained. The mechanic told me that there is something turning on when the car is off, which is causing this to happen. I tried replacing the battery but it is the same. I was told that the alternator is definitely working properly while the car is on. I had the battery load tested and no unusual drain was detected. Do you have any idea what might be causing my battery to die out each night?

Hello there, thanks for writing in about your 2009 Chevrolet Aveo5. Batteries that drain overnight are not uncommon. This is called a parasitic drain and can have many different causes. The most likely are any aftermarket electrical accessories, such as the radio, a power seat, window switch, dome light or wiring fault. I recommend having a certified technician look over the vehicle’s electrical system in order to diagnose why the battery keeps draining and make the necessary repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Battery charging Indicator is not glowing properly.

Check the charging unit (alternator or generator) on the heavy equipment and see if there is a charging voltage of 13.5 volts to 14.7 volts when the engine is operational. If there is only battery voltage, then the charging unit...

Q: Tbi problems

The fuel injector is a simple part. You can test the injector by giving it power and ground. If there is fuel pressure, it will spray for as long as you hold the power on. You can also check the...

Q: My cars dim lights won't work but works only when i switch to bright then it lights up, so what could be the issue?

Hi there. This issue is typically caused by a headlight dimmer switch problem or an electrical relay issue behind the dash. It could also be an electrical short within the switch itself. It's probably best to have the headlight switch...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.