2004 to 2020 Mazda 3 Forum and Mazdaspeed 3 Forums banner
1 - 5 of 5 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter · #1 ·
Hi,

every two weeks my gfs car battery completly discharges. A quick look and you see the battery is dirty as all hell.

Step #1 Battery clean up with warm water and baking soda.

I want to remove the connectors for better cleaning but im afraid of losing the 12volt memory and resseting the car.

Question: Can i plug my cars positive battery to her positive connectors and my negative to her chassis so i can remove her battery?

Once clean i will hookup my motomaster battery charger
Font Gadget Automotive design Output device Audio equipment


This item claims it can detect faulty battery. Not sure if it takes into consideration for parasitic drops or alternator fault.

Any tips for furthur troubleshooting?
 

·
Registered
Joined
·
839 Posts
Cleaning the battery posts is a good idea. It's not uncommon for dirty terminals to leak power. Personally, I wouldn't worry about losing memories by disconnecting the battery, although you will have to reset the clock and whatever else your car requires. It's generally not a big deal.

I have seen devices that allow a person to remove the battery without having to reset things. I believe they use a small battery. You might Google the topic if you're interested.

About the idea of using a battery charger: I would be very careful. I've never tried to do it, but I would be worried that the battery charger's output is not very "clean," and without a battery in the mix to smooth out the charger's production, the car's electric system could be harmed in some way.

If cleaning the battery terminal doesn't improve things, you might try measuring the parasitic draw of your car to see if there's an abnormality. I've been told that the acceptable parasitic current draw of a modern car should be around 0.03 Amps (30 milliamps), but it can be up to 0.075A or even 0.1A in some modern cars.

New cars today have a growing number of electronic devices that have memories that continue to draw energy even after the key is off. Such parasitic loads can run a battery down in a matter of weeks, if not days, if the car is not driven regularly or otherwise charged or, alternatively, the battery is not disconnected from the system.
 

·
Registered
2012 Mazda 3 GX MT5 non sky
Joined
·
824 Posts
How old is the battery ?
 

·
Registered
Joined
·
477 Posts
"Question: Can i plug my cars positive battery to her positive connectors and my negative to her chassis so i can remove her battery?"

I've used a battery charger to hold 12V on the system when I've replaced the battery on older cars. I haven't done it on the Mazda but I don't see why it won't work.
 
1 - 5 of 5 Posts
Top