Battery replacement

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Jul 15, 2019 | 12:41 PM

CR172

Thread Starter

Fleet Mechanic

Joined: Feb 2017

Posts: 1,597

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From: N. Texas

Battery replacement

I know this has been discussed before but I'm not finding much using the search function. After almost 4 years and 76K miles my OEM battery is starting to get weak. Hasn't done anything odd or weird but I did notice it was cranking a little slower over the past weekend. I will probably go with another Motorcraft battery unless someone can tell me differently. Can I just put the fully charged new battery in or do I have to stand on one leg while tapping the top of my head and rubbing my belly at the same time?

Jul 15, 2019 | 01:45 PM

bedwards

Tuned

Joined: Oct 2000

Posts: 432

Likes: 6

Someone who knows more will chime in soon, but I think it has to sit unused and locked for more than 8 hours to learn the new battery or you can take to dealer and they can flash it.

Jul 15, 2019 | 02:19 PM

JKBrad

Moderator

Joined: May 2005

Posts: 8,237

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From: San Antonio, TX

I put a Super Start battery from O’Reilly’s in mine. Made by Deka, it’s highly rated.

My OEM battery died at exactly 2 years of ownership. Slow cranked for a few days, then nothing. The build date on the truck is 10/15/15 and I bought it on 12/19/15, so it’s not like it sat on the lot for a couple of seasons.

I didn’t get it warrantied because I needed to use the truck later that day and I didn’t want another Motorcraft battery.

As far as a BMS reset, the truck usually sits for more than 8 hours after each use.

Jul 15, 2019 | 02:38 PM

CR172

Thread Starter

Fleet Mechanic

Joined: Feb 2017

Posts: 1,597

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From: N. Texas

Thanks JKBrad. Does it have to be locked as the other reply suggested? I only ask because I never lock the truck at home. Heck, half the time the keys are in it......

Jul 15, 2019 | 04:00 PM

Kingofwylietx

Fleet Mechanic

Joined: Nov 2016

Posts: 1,634

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Quote:

Originally Posted by JKBrad

...
I didn’t get it warrantied because I needed to use the truck later that day and I didn’t want another Motorcraft battery.
...

I think you could have filed a warranty claim on that battery by stating you had to buy it....then got a refund of some amount.
It might not have been worth the hassle, but I think it would have been a possibility.

Jul 15, 2019 | 05:51 PM

JKBrad

Moderator

Joined: May 2005

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From: San Antonio, TX

Quote:

Originally Posted by Kingofwylietx

Yeah, not worth the hassle for $125 or so, by the time I would be done arguing about it.

CR172, I don’t know about locking it, wouldn’t hurt to try. Only takes a second.

Also, if you have a charger at home, charge the battery to 100% before you put it in. If not, make sure the battery you buy is charged at 100%. If not, the BMS will only want to maintain it at the level of charge it has when you install it.

Jul 15, 2019 | 08:20 PM

srb1194

Tuned

Joined: Dec 2005

Posts: 424

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After installation do you have to relearn all the windows and sunroof? I know you have to on a MB. Just curious, I'm 2 1/2 years on the original battery and 80K.

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Jul 15, 2019 | 08:36 PM

GABAR

Lead Driver

Joined: Dec 2016

Posts: 5,650

Likes: 243

From: GA

Quote:

Originally Posted by CR172

Check out Northstar Batteries.

Also, I was told by ford390gashog, who’s a subscriber on here, that once the battery is replaced, one of the modules in the truck must be reset.

Jul 15, 2019 | 08:38 PM

#10

srb1194

Tuned

Joined: Dec 2005

Posts: 424

Likes: 2

Quote:

Originally Posted by GlueGuy

If you attach a battery tender to the leads before you disconnect, all the settings will remain.

Thank you!

Jul 17, 2019 | 02:53 PM

#11

PupnDuck

Fleet Mechanic

Joined: Jul 2005

Posts: 1,470

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From: Staten Island, NY

Here's what you need to do if you install a new battery. Or you can use Forscan to reset the BMS. Don't forget the entire system is designed around an AGM battery. It might not work as designed with any other battery chemistry.

Battery State of Charge

The Electrical Energy Management system monitors the battery current flow and voltage to determine the battery state of charge. During the drive cycle the Electrical Energy Management system software monitors the charge and discharge current and increases the state of charge during charging, and decreasing it during discharge. During rest periods (key off with no electrical loads) when the vehicle enters sleep mode, the battery voltage is sampled to calibrate the state of charge. The battery monitoring sensor automatically executes a calibration anytime the vehicle enters sleep mode and the total vehicle current draw is below 300mA. It takes 8 hours in the sleep mode to calibrate the battery state of charge to high accuracy. If the system draw has not allowed the battery state of charge to calibrate over the previous 7 days, the state of charge quality factor changes to identify this and some Electrical Energy Management system functions may be temporarily turned off until a calibration takes place.

NOTE: Any devices left attached to the power socket that draw more than 200mA (or less depending on other battery loads), prevents the battery monitoring sensor from calibrating the battery state of charge.