This was my exact experience with the V2 battery. Same error at times when I was not driving. I would never have caught in unless I went into the Notifications screen on the car.
I have a question. Did you let the car sit for a while after you removed the stock battery and disconnecting the HV battery before installing the Ohmmu and powering the car back up?
I had one more Vcfront_a180 error from overnight. I also relayed this information to Ohmmu through my existing support ticket. I think I will also go back to the OEM 12V battery later today while this gets sorted out. I just can't explain why some people don't encounter this error and some people don't. Must be different hardware in the different iterations of the Model 3.
The problem here, Hankook purchased salome Ohmmu batteries before Lion was available in the Y's. They reverse engineered the current battery from the Ohmmu design. Tesla, introducing an over charge test for Lead batteries that wasn't there previously brought on the issue. Normally I would say well thats the way it goes. However, since Tesla has done away with Lead batteries, that means there will be a finite number of AtlasBX batteries made. At some point, an alternative solution will be needed. Some say use any lead battery. That will work, but the AtlasBX is 625CCA and the closest alternative I have found is 500CCA. You can't even purchase the AtlasBX unless from Tesla. With a lesser 500CCA battery and cold weather, the issue becomes how well would it perform. A solution of being able to disable the overcharge test in the later software versions would cure the Ohmmu issue. The Lion batteries have a built in BMC. It disconnects from the car is over voltage seen (as it should). After 5 minutes it reconnects.and continues charging. But the car sees that as a failure and throws messages. There is the issue. Also, I am not in any way affiliated with Ohmmu. I just believe in the product as a good alternative. BTW, the older X and S don't have this issue.
I would say it's not important for Teslas. Batteries with higher cranking amps usually have thinner lead plates. The thinner lead plates reduces their longevity. Deep cycle batteries usually have lower cold cranking amps and thicker plates for better longevity.
At least 2 people on this page have said that they are experiencing issues and have the V3 battery.
All that is needed is a way to deselect the over voltage test to the battery that was added about 6 months ago by a Tesla engineer.
I don't disagree, however if this test doesn't impact their own batteries (lead acid or lithium) or in fact helps preserve them then I see no reason they would provide an end user toggle for it just to satisfy a third party need.
You make good points. In my opinion, it's a long shot that Tesla will take action on this topic.
