replacing agm battery with regular battery?
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
The difference between an AGM and Flooded Lead Acid is their build and resulting characteristics.
In Ford systems the AGM is not charged at the higher level of the Lead Acid type. That being 14.7 for AGM and well higher for L.A. types.
The state of charge is also different, aging is different and program handling vs core temperature is different.
If the program algorithm is not changed from AGM to Lead Acid and (battery size accounted for), the Lead Acid will be continuously >under charged resulting in possible issues with other functions and battery shortened life.
Replace the battery with the original build type and reset the Battery Management Module to zero out the last battery control data accumulated.
Bottom line is you cannot just throw anything in and meet the original system design and performance intent, even though is starts the vehicle, seems to work well, but will be affected later in its life span, giving you more issues than it should.
Good luck.
In Ford systems the AGM is not charged at the higher level of the Lead Acid type. That being 14.7 for AGM and well higher for L.A. types.
The state of charge is also different, aging is different and program handling vs core temperature is different.
If the program algorithm is not changed from AGM to Lead Acid and (battery size accounted for), the Lead Acid will be continuously >under charged resulting in possible issues with other functions and battery shortened life.
Replace the battery with the original build type and reset the Battery Management Module to zero out the last battery control data accumulated.
Bottom line is you cannot just throw anything in and meet the original system design and performance intent, even though is starts the vehicle, seems to work well, but will be affected later in its life span, giving you more issues than it should.
Good luck.
Mountain Pass
Joined: Feb 2010
Posts: 140
Likes: 17
From: Brantford Ontario
Just a quick other note : An AGM batteries terminals are backwards to a regular acid battery (@ least on my 2016) ..
To me It didn't look like you could put an older style battery in there ???
To me It didn't look like you could put an older style battery in there ???
Lead Driver
Joined: May 2015
Posts: 5,881
Likes: 359
From: Mts. S. of San Francisco
I'm not sure that's universally true. I know some manufacturers make two versions of many batteries with the terminals placed oppositely for each.
New User
Joined: Aug 2018
Posts: 3
Likes: 0
I had an almost new agm I installed, from a vehicle I sold. Terminals were reversed compared to original battery in truck. Was able to make them reach both posts.
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