Just ran across this thread ....changed my battery back in April....dealer was expecting a AGM but my factory oem wasn't....they didn't have nether battery in stock so I bought a Costco AGM battery and put in in myself...dealer told it would be fine and actually better for the truck with all it's acc. never said anything about a reset....I never even thought about it and I've never had any problems should I be pulling out Forscan for the fist time in a yr. or so or just let it alone....I'd hate to start causing problems?

 

I think I would reset it as it has been said in this thread it could cause new battery to go bad quicker as it will still be charging according to old battery condition. Read post 27 again. But it’s your call your truck.

 

In all the threads on batteries and the BMS, no one can say how much "quicker" the battery will go bad. Even Stormsearch could not say for sure the difference.

Another point is that those that live in rural areas do not drive a hundred miles to a dealer for a new battery. Whatever fits in the battery tray and the post line up with the cables.

So my question is " how much of a reduction in battery life" can be expected if the BMS is not reset.

What is the outcome if a flooded battery is replaced with an AGM battery and no changes are made to the charging system?

 

Since no one can answer your question why don’t you try doing it in your truck and report back. As referred to in post 27 I’ll heed the recommendation of the Ford General service bulletin.

 

Well, his no - remote issue started after he changed out the battery. I guess some of us might start with a reset on the Battery Monitoring System. . Sure seems like the logical and cheapest first step.

 

GREAT question! Sadly we will never get answers from Ford other than vague generalities.

It is inconvenient to do for those of us used to just putting in a fresh battery. I reset to new-battery and type with the new AGM I put in using Forscan because the AGM costs $250 I want to give it the best opportunity for a long life..

 

Thats a good idea, and I will be doing that when the current battrry dies.

But since John Q citizen lives over a hundred miles from a ford dealership and has no access to a Ford General service bulletin your statement is useless.
Why would Ford require it other than to generate revenue for dealers?

Like Blackbuzzard said. We'll never know.

 

And I'll never know either. Way too many factors to consider - lot rot, vehicle usage, KOL/aux equip., temperature, vibration, battery mfg. defects likely imo will have more influence on battery longetivity than a BMS reset. BMS reset is recommended for max. start/stop functionality and stop premature vehicle/audion shut off.

Disconnecting the battery temporarily resets battery SOC to a high value that will allow remote start to function. If BMS reset is not done, over time it may think a lower than actual SOC is inthe battery and prevent remote start functionality. An 8 hour sleep mode only works if the BMS is reset for new batteries.

 

Hi Stormsearch,

So...... BMS unplugged, no auto start/stop.

Will my truck blow up if replace the flooded with an AGM battery without taking it to the dealer for a reset?

 

LOL - nope, not even close. SLI flooded battery has a different charge profile than AGM would be another reason to get FORScan, change battery type and reset BMS. Not resetting BMS and different battery does lower age but AGM's are "flattening that curve".