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Replacing 12v Battery - procedure?

Replacing 12v Battery - procedure?

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  #1  
Old 03-08-2018, 09:27 PM
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Join Date: Mar 2010
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Default Replacing 12v Battery - procedure?

The existing 12v battery in my 2012 is only 3 years old, but is weak (barely passes a load test). I'd like to replace it, but is there a special procedure required?

On regular vehicles, after battery is replaced I may have to reset radio programs and it may take a few drives for the engine control unit to relearn the fuel trims.

But on the FEH, is there a special procedure once battery is pulled and replaced? Any practical experience you might share on the FEH?

Many thanks.

Pat
 
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  #2  
Old 03-08-2018, 09:30 PM
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Default Re: Replacing 12v Battery - procedure?

Can't say it's any different than any other vehicle. I prefer to let it idle for a few minutes after replacing the battery, so it can assess the HV battery state of charge at more moderate currents.
 
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  #3  
Old 03-09-2018, 04:56 AM
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Default Re: Replacing 12v Battery - procedure?

On most cars you can preserve existing settings by connecting 12V to the dash power outlet (Cigar lighter socket). You can use a jumper battery with appropriate cable. You can also buy a tool that uses a 9V battery. As long as the voltage stays above a certain value the settings and memory will be preserved while you swap the battery. All shops use a version of this.
 
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Old 03-09-2018, 09:40 AM
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Default Re: Replacing 12v Battery - procedure?

Thanks all for help. Will advise if I run into any unexpected issues.

Pat
 
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  #5  
Old 03-11-2018, 03:34 PM
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Default Re: Replacing 12v Battery - procedure?

Per RexB suggestion, I connected a 12v to the vehicle while swapping out the battery and all settings were preserved.

Thanks for suggestion.

Pat
 
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