Thanks, no Menards around here. Car is almost 5 years old, so about time for the battery to go I expect. I might spring for the Delco battery for $180 at AutoZone, as it is the right size and has the vent port. Tesla service center is a 6 hour round trip, so I'd rather spend the extra $50 than wait almost 2 weeks for them to replace it.
TL/DR I made it fine for 2 weeks but it’s dependent on how quickly your 12 volt continues to decline
. No issues (other than the mental pain of an ocd person having to ignore all the error codes ) and car never did the self reboot again. Your results can vary depending on how quickly from time system detects battery issue (low voltage or whatever it sees) to when battery degrades to point it cannot function even when continuously connected to main battery. (another issue your car will not sleep when detects low 12v so as to decrease chance of stranding you)
There’s a mobile tech came to my home for other issues. He opened the fronk bottom. I saw him torn off a piece of tape that covered a cable. After he finished the service, he told me that my low voltage battery might need replaced next year. After he left, I checked the 12v battery, there’s still 14.5 v. In the following shop service, I told this story to the front desk. According to the front desk, they re-wrapped cable. A few months later, I got a warning on the screen, saying my low voltage battery needed to be replaced. I checked the battery. It was about 12v. My car just past warranty. From that mobile service to the warning sign showing up only took about 3 months. What can happen during this short period of time? Thanks!
The mobile tech changes batteries often. His guess was probably from experience and the age of the existing battery.
I would not spend my time or money on a li-ion battery in a Tesla that was not specifically designed by Tesla to handle it. Even if the battery manufacturer makes big claims.
If the 12v battery is totally shot, no a trickle charger won’t do it. 5A should be safe.
The main battery pack is temperature regulated. A faulty AC may contribute to the main battery charging issue. If out of warranty, in FL is electrified garage they are Tesla specialists. They may be able to look at it. Also, if you can access service mode and look at the Service Notifications more information may be there about what is going on.
The service technician said they cost about twice as much and don't really last that much longer from what he's seen. Now I'm getting another warning that the 12v battery needs to be replaced. I'm wondering if I got a bad one as a replacement. But the contactors keep making that clunking noise every once in a while. I've got 150 miles of range left but it's not letting me charge with the wall connector. I'm going to drive down to the service center tomorrow in my other car and see if I can get a mobile tech to come and put another battery in and then drive the car and turn on the air conditioner to make sure that I'm not getting any other messages.
I say it's the opposite, most of these are being replaced under warranty. The ones paid by customers are pretty much being sold close to at cost (you will not be able to find a third party option for cheaper, even from no-name brands, and the labor they charge is just enough to pay for the technician; they lose money if you count the travel costs if using mobile service).Yes, yes we do.
I'm fully convinced that Elon has a master control board where, by the turn of a dial, he can determine how many 12v batteries should fail this week.
If you really think about it, this has to be true. They're making HUNDREDS of dollars a week by doing this. Follow the money.
I have a 2020 M3 I got at the very end of 2019. I had a recall mobile service for a rear harness electrical cable replacement about 12 days ago, just before my 4 year warranty expired. Other than changing tires, this was the first time I had any service done on the car. I too asked if there was anything I should be looking at before the car went out of warranty and he said no. 1 or Two days after my warranty expired, and 8 days after the harness replacement, I started getting low voltage battery messages. My estimate expired, but I think it was around $350.
Sounds like a 12 volt battery needs replacing. Nothing to do with a harness. Any 51R works or go to Tesla. There are lots of DIY videos including on the Tesla web site to do the battery change.
