Skip the auto shop - Our mechanics make house calls

Q: New battery drain

asked by on

I have a brand new battery that drains overnight. When I charge it for 4 hours it's good for only one other night
My car has an automatic transmission.

It could be that the battery is in need of replacement or that there is a parasitic draw somewhere in the system. The latter happens when something gets left on, either due to human error or because of a problem in one of the circuits. An example of human error is a dome light being left on because someone forgot to turn it off. An example of a circuit problem is a short causing the dome light to stay on. A parasitic draw can be determined by placing an ammeter in line with the negative battery cable. Generally, a draw of more than 30 milliamps on an older vehicle such as yours indicates a problem. A skilled professional, such as one form YourMechanic, will be able to determine while your battery goes dead and repair the problem.

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: Not starting distributor spark

Hi there. You need to see if the distributor is turning when the engine is cranking. If not, then the vehicle has a broken timing belt. I would usually check the timing belt to see if it is intact. If...

Q: How do I turn on the Uconnect phone system?

Turning on the Uconnect phone system is very easy. When you turn your ignition from OFF to ON/ACC or START, your Uconnect phone system will start up. It takes the Uconnect system roughly 15 seconds to start up. After 15...

Q: Van stalling - 1993 Chevrolet G30

Have your fuel pressure checked with the engine running, as well as checking for a dirty throttle body. Running out of gas may have stirred up sediment in the tank which has somehow found its way to the fuel injectors....

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...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.