Take it to the dealer while you are still under the 3 year B2B warranty. Hopefully you are.

I don't believe there is a 12V that turns on/off with the car. My dash cam running for 15 min after I turn off the car successfully helped me nab a hit n run neighbor. So it's not all bad that the 12V stays on a while after turning off the car.

thanks for sharing. I'll have to give that a read. I'm pretty good with my circuits and basic electrical stuff, but I freely admit I have no idea what happens when there is an issue with one cell in a parallel group of cells. Also back to the OP. I'm pretty sure the BMS will balance the cells if nee...

Not to be nit picking.... ok, I guess I'm nit picking here :lol: It would be impossible for one of the five cells to have a different voltage than the other four in a parallel group because the battery terminals from all 5 cells are electrically connected. When it comes to cell balancing you are act...

The RFA module is what interacts with the fobs. First thing I'd try is disconnecting the 12V battery, give it a few min. and then reconnect. That should "reboot" all modules in the car. Hopefully your RFA module isn't going bad. That would be really expensive to fix.

There are 86 Groups of 5 parallel cells, wired in series. Or more simply in battery short hand: 86S5P The way you worded it made it sound like you meant 5S86P. After rereading what you wrote I now understand that isn't want you meant. Not using words like "bank" or "group" to clarify. The way batter...

I wired in my dash cam in and the 12v circuit in the car stays active for about 15 minutes. This actually saved me because it resulted in the recording of my next door neighbor backing into my car who had no insurance and refused to pay for it. So I guess It really didn't save me because they never ...

You got that a little backwards. it's 86 groups of 5 cells each.

Are you saying they removed the battery low warning when you are down to 10 miles left on the guessometer from the '17??? I have to agree with jmueller065 seeing that you only have single digit miles left isn't enough of an indicator for you?

Thanks for the good info!

My 12V was replaced under warranty 2.5 years ago when my TCU killed it. I had planned replacing it with a deep cycle Optima battery when the oem motorcraft gives up the ghost, but with the cost of the battery you found it's really hard to justify the expense of the Optima.