Skip the auto shop - Our mechanics make house calls

Q: Something draining the battery

asked by on

The battery in my car is dead. I jumped it and ran it for 30 minutes. Usually it restarts after charging for that long. Don't know if the alternator or battery, or both, are bad. Something is draining the battery.

If it ran for 30 minutes after a jump, the alternator is probably ok. I would start by checking the battery first. Alternators are not designed to charge a dead battery. A good battery, that is completely dead, takes more than 4 hours to charge on a 20 amp charger. I would have the alternator tested after the battery is replaced. If you would like this repaired, consider having a qualified mechanic, such as one from YourMechanic, come and test why your car is having issues starting.

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: On interstate, car severely vibrated and pulled to left

Hi there. There is indeed a recall for this exact issue - it is #06186 and it calls for crossmember replacement. I recommend you present this recall to the dealer so they can make things right.

Q: After replacing crank senor and cam sensor tack only works for 2 to 3 seconds after start up snap on tool show tach

This may be caused by a faulty transmission speed sensor. The speed sensor reads the rotational speed of the reluctor wheel, located within the transmission. When this is not working properly, you may also notice the transmission hesitating to shift...

Q: Starter won't turn over

Hi there. It is possible for the cables to develop excess resistance over time due to rust and corrosion, however, there could be an issue with the starter itself. A certified technician, such as one from YourMechanic, would be able...

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...
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 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...