battery drain, how to check?

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=6874
Printed Date: October 31, 2024 at 6:09 PM

Topic: battery drain, how to check?

Posted By: Ohmz
Subject: battery drain, how to check?
Date Posted: December 19, 2002 at 8:42 AM

Hey guys! I have a simple question. I have a customer that says his battery is running low. I can't recall the reading I'm suppose to get on my DMM when there is nothing in the vehicle that is making the battery to run low. Can someone remind me! Thanks!

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My Personal Installer Note: Connectors are easy, neat, and professional. But do you know how to crimp properly?

Replies:

Posted By: Velocity Motors
Date Posted: December 19, 2002 at 9:03 AM

A healthy battery is about 12.2 - 12.8 volts
A not so good battery ( but still operational ) is about 11.4 - 12 volts
A battery needing replacement will read under 11 volts ( about 10.5 - 10.8 )

I hope this is what you were wanting.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: DanDan
Date Posted: December 19, 2002 at 8:00 PM

Anything over a 25ma draw is considered parasitic. Use your DC ma current setting on your dmm. Put it in line with your battery to check to see if the battery has a parasitic draw.

Dan

Posted By: Ohmz
Date Posted: December 20, 2002 at 12:16 PM

Thanks Jeff / Dan. This should be helpful enough. I will check over the weekend. I'm pretty sure there is something drawing from the battery because the vehicle was in a recent accident and was ok before.

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