Originally Posted by Mlarv

You can do it yourself. Just look in owners manual for how to reset the BMS

Originally Posted by deo59

I replaced my battery on my 2016. Put my trickle charger on the cables, disconnected and swapped the battery and removed the charger. No problems.

Originally Posted by stormsearch

So here is the jist. The Manual procedure does work. I was told by my calibrator a couple years ago that for US vehicles it was disabled. However, last year was able to finally get into our work garage and do some testing. The manual procedure is enabled on newer F150's. Talked with our new lead calibrator and received some better insight on what the reason was for not providing this information beforehand. The issue in having a manual BMS reset procedure is it allows both the assembly plant and selling dealer to immediately reset the BMS SOC and deliver as good when essence, the battery could be good, partially bad/weak, or on its last leg. Ford has requirements on battery quality/SOC before being shipped from the plant and as a selling dealer. A BMS reset bypasses that and can create a disgruntled consumer.

So with that being said, I have pushed to get the manual procedure added to the owner manuals for vehicles the manual procedure is enabled (which is nearly all Ford vehicles except a few). Ensure the battery light flashes after doing the procedure. I could not provide this detail earlier as it was not public information. There is much more to the BMS operation, differences between MY's and vehicle lines that I can provide. I have stopped sharing information because it can lead to false presumptions.

Another item that I have tested was the BMS able to learn on its own a new battery has been installed. There are algorithms in the BMS for the more likely case that a consumer replaces their own battery and not perform a reset. It is not an exact timeframe, but around the 3 week mark after replacing with a new battery, the BMS will know a new battery has been installed and will reset. Note, testing was only conducted with as built batteries. Replacing with another type of battery may delay or incorrectly set a different of the actual battery.

The one advantage of performing a reset are for vehicles that have the "Vehicle Shutting Down to preserve Battery" message. If the BMS reset is not immediately performed with a new battery, the BMS will continue to protect thinking the old battery is installed.

I want to end by saying, Ford requires the dealer to perform a BMS reset as we pay for the replacement cost and warranty that work. We don't require a consumer, auto parts store or anybody else to perform the reset. In the big scheme of things, performing a BMS reset is minuscule to how the battery was manufactured, lot rot, vehicle drive conditions, vehicle issues, added equipment and maintenance. I replaced my OEM battery with a non-OEM, same size H6 AGM from Napa. I chose that battery due to the mfger. I did not perform a BMS reset. It is simply not that important.

Originally Posted by maco

I believe I'm right in saying your method did not reset the age /condition of your older battery so it will be maintaining the stored charging info for a much older battery !!