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Battery replaced 1year ago but BMS not reset at the time. Reset now?

45K views 68 replies 11 participants last post by  wiz043  
So, here's a thought....Perhaps the whole age of the battery thing is important for the car to calculate/estimate how much charge the battery can/should hold and how much to dial back the charging capacity/supplied charge? Kind of like Apple's infamous iOS battery management system in their i devices. Apple admitted to dialing back the battery capacity and performance of their devices with some of their OS updates "since the battery is known to have a finite life and as a way to mitigate its demise but retain optimal performance of the devices" While I don't believe that for a second from them, perhaps Ford is using something like that since you have features like Auto/start-stop, remote starting, fuel pump priming for the DI system etc.

The post about the charge suddenly going from

For example, the Auto/start stop system stopped working (thankfully) in my daughters car shortly after she bought it, the battery is now two years old and we live in phoenix where batteries get cooked in as little as two maybe 3 in most cases. If the battery can't be trusted to be reliable based on age then, it shuts that feature off. Granted ford won't do what Apple does but, i can have some oversight.
Update time.

I had a schedule change for this morning so I had time to pull the cowl and get to the battery. Unfortunately, although the battery seemed to have removeable cell covers it was sealed so that was a total waste of time. Not much though as I'm getting really good at it now. ?

Having charged the battery last night and letting it sit this morning, I decided to do the reset. Here is the before resest BMS state in Forscan.
View attachment 75948

The ignition had been on with Forscan running for a while before I did this but note the Battery State Charge % is 75%

After the reset, these are the readings:
View attachment 75949

The charge has gone from 75% to 84% in 30 seconds with only a change in battery age. That seems to indicate that it has a significant impact on the system's determination of charge state.

I will drive it for a few days, locking it and pulling the cell charger at night, then do another Forscan reading and report back in a week or so.

Till then thanks again for everyione's time and input. I hope whatever holiday you celebrate you have a good one.
So, here's a thought....Perhaps the whole age of the battery thing is important for the car to calculate/estimate how much charge the battery can/should hold and how much to dial back the charging capacity/supplied charge? Kind of like Apple's infamous iOS battery management system in their i devices. Apple admitted to dialing back the battery capacity and performance of their devices with some of their OS updates on older devices "since the battery is known to have a finite life and as a way to mitigate its demise but retain optimal performance of the devices" While I don't believe that for a second from them, perhaps Ford is using something like that since you have features like Auto/start-stop, remote starting, fuel pump priming for the DI system etc.

For example, the Auto/start stop system stopped working (thankfully) in my daughters car shortly after she bought it, the battery is now two years old and we live in phoenix where batteries get cooked in as little as two maybe 3 in most cases. If the battery can't be trusted to be reliable based on age then, it shuts that feature off. Granted, i don't think Ford won't go to the extreme that Apple does but, I can see battery mitigation in these so electronically driven cars being a good thing.