Skip the auto shop - Our mechanics make house calls

Q: New battery drained for no reason

asked by on

My four year-old battery died in my car. I replaced it with a new battery and a few days later, it was dead. None of the lights work and I can't find any reason why it would be drained.

A: There is most likely an electrical componen...

There is most likely an electrical component that has failed, causing the battery to drain. These can be very tricky to diagnose. Basically, you need to be able to measure how much current is being drawn from the battery when the car is at rest, and slowly disconnect components one by one until there is no more current being drawn. Once you find the component that drops the current draw, you have found the problem. I would ask for help from one of the mechanics at YourMechanic to perform this test on your electrical components to see what is causing your battery to die.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: What does it mean if the Charging System light on the dash of comes on?

Your car’s charging system is an essential component – without an operable battery and alternator, your car won’t go anywhere. If the Charging System light is flashing on the dash, there’s something wrong. The main reason for the light to...

Q: I have a leak in the coolant system that I have narrowed to I believe is the water inlet tube off of the lower radiator hose.

First off, I would say it would be best to pressure test the cooling system to verify where the coolant is coming from. With the complexity of repairs to the cooling system on this vehicle, it may be worth the...

Q: The right rearview mirror defroster isn't working but the left one is. What should I do?

According to the wiring diagrams I have available to me, you are correct that both of the mirror heater assemblies are powered through a common fuse. I would suggest gaining access to the electrical connector on the passenger side mirror...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...