What Is Key-Off Battery Drain? | YourMechanic Advice

What Is Key-Off Battery Drain?

Many things in your car continue to work even after your vehicle is turned off – radio presets, security alarms, emissions computers and clocks are just a few. They continue to draw power from your car battery, and the cumulative load that these devices produce is called key-off car battery drain, or parasitic drain. Some drain is perfectly normal, but if the load goes above 150 milliamps, that’s about twice what it should be, and you could end up with a dead battery. Loads below 75 milliamps are normal.

What causes excessive parasitic drain?

If you find your battery dead in the morning, chances are it’s because something has been left on. Common offenders include under hood lights, glove compartment lights, or trunk lights that fail to turn off. Other problems, like shorted alternator diodes, can also cause excessive key off car battery drain. And of course if you forget to turn off your headlights, your battery can discharge in a matter of a few hours.

Whether the problem is key off drain, or a faulty battery, the last thing you want is to discover that your car won’t start, especially on a cold winter morning. If it does happen, though, our mobile mechanics can help. We come to you, so you don’t have to worry about having your vehicle towed. We can diagnose your car battery problem, and determine if the problem is key-off battery drain or something else within your vehicle’s charging system.


Schedule Brake Pad Replacement
Service Area

$124.92 - $448.62

Price range for all vehicles
Average rating from 12,254 customers who received a Brake Pads Replacement.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Excellent Auto Repair Ratings.

4.2 Average Rating

Auto Repair

Service Hours

7 AM - 9 PM

7 days a week

Phone Number

Phone Hours

Mon - Fri / 6 AM - 5 PM PST

Sat - Sun / 7 AM - 4 PM PST

Address

We come to you at no extra charge

Guarantee

12-month/12,000-mile warranty

Service Area

Recent Brake Pad Replacement reviews

Excellent Rating


YourMechanic Brake Pad Replacement Service

Average Rating

4.9/5

Number of Reviews

12,254

Rating Summary
11,707
348
73
35
91
11,707
348
73
35
91

Bryant

11 years of experience
407 reviews
Bryant
11 years of experience
Ford Fusion - Brake Pads Replacement (Front, Rear) - Indianapolis, Indiana
Bryant has done great work on my car before, the latest work is no exception. He's very flexible, and goes the extra mile to get you back on the road.
Scion iA - Brake Pads Replacement (Front) - Carmel, Indiana
This is my first time using this service. I am very happy with it. Bryant was very knowledgeable and did quality work. I will use this service more regularly.

Augustine

11 years of experience
57 reviews
Augustine
11 years of experience
Volkswagen Passat - Brake Pads Replacement (Front, Rear) - Albuquerque, New Mexico
He’s amazing! Did a wonderful job on my brakes and was extremely knowledgeable, and a real fun guy to be around as well!

Jimmi

25 years of experience
68 reviews
Jimmi
25 years of experience
Mazda CX-9 - Brake Pads Replacement (Rear) - Orlando, Florida
Jimmi was wonderful. He was on time, knowledgeable, and completed work in a timely manner. He went above and beyond with helpful tips and recommendations. We will be using him for all our family vehicles.

Robert

3 years of experience
4 reviews
Robert
3 years of experience
Toyota RAV4 - Brake Pads Replacement (Rear) - Tacoma, Washington
Came right on time! Had all the necessary tools to finish the job. After the test drive, he gave me an update on my car. Topped off my fluids and disinfect the inside. Well recommend!!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE