Ok folks... I was deliberating posting this since it turns my thread from a "check your 12v battery" into a "Tesla Service SUCKS" thread. But whatever... here goes.
So my wife was super annoyed at all the bitching I was doing about the Tesla tech giving zero sh!ts and half-assing the battery replacement. She was actually headed down to the Dublin, CA area and the service center there said she could stop by so they could do the job the mobile tech failed to do.
She took the car in yesterday, and they did this.
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@jjrandorin knows about my perspectives about half-ass-it-tude. I think this performance by Tesla is sub-par. But I'm sure some of you readers are thinking 'ehhhh, looks pretty good.'
Luckily my wife is similar to me. She was like "WTF are you kidding?" What type of lazy SOBs are working for Tesla Service? The Tesla service advisor said that was the best they could do. Replacing that 12v battery and cleaning it to what you see in that picture was already a courtesy of above and beyond quality and commitment to excellence. He said that was "clean" and he'd be happy with that in his own car. He said he didn't know what "grease" or "protection" my wife was asking about.
Anyway, eventually the service manager got involved. He took one look, brought over some battery acid cleaner and dielectric grease, and cleaned up everything in the parking lot of the Tesla service center. Now it looks great. It shouldn't require this much and wringing and bullcrap to get the repair done correctly in the first place.
PS, nobody knows why the original battery corroded like that. They said I should keep an eye on it and let them know if the corrosion comes back. There's a chance the 12v battery is being over-charged, but they don't have the tools to test that.