Most people don’t want to believe me on this, but I’m convinced the battery drains if the key fob is anywhere near the vehicle. Put it in a Faraday box or store it 30 feet away from the car. That was the results of my testing. Perhaps not all cars behave this way.
Not me Cliff! I am convinced you are most definitely onto something with this! I feel you are absolutely correct in your "FOB" testing, and the results! I have moved the location of my FOB further away within my home, and the battery stays up to stuff longer then before I moved it away! I did not try a faraday pouch yet.
My 2023 Naut, would go into saver mode after sitting more than 3 weeks of no usage. Fortunately, I always have been able to start it with no problems. After moving the FOB further away, I can now go well over the 3 weeks with no power saver mode activation. I have since added a battery trickle charger to the routine if left over two weeks of no usage to keep sulfation at check.
I feel what is aggravating the situation on the 2024's is the battery's initial state of charge at delivery. I do believe that (Kristy) took delivery of a vehicle with a compromised (sulfated) battery to begin with! A few folks above have posted similar issues of 12v battery failures on relatively new deliveries. Someone posted (cannot find it at the moment) a portion of the pre-delivery check sheet. Of note was..... "
battery must be at 70% charge minimum..."! Obviously, this is not happening in some cases. The trip from factory to dealer is long, wrought with startups & shutdowns. Plenty of time for a good battery to start sulfating.
I agree, a FOB in close proximity as you suggest seems be a constant draw on the battery.
A weak battery will drain that much more quickly in my opinion.
About keeping a FOB in the vehicle after shutdown makes me wonder if programming would not allow vehicle sleep mode to occur. Not sure if this is the case, but if so, that would account for significant battery drain that a compromised battery possibly could not handle.