Tesla to fix rapidly dying 12v batteries with software update.

[AndromedaRacer]

So it's a software issue that ruined the prior battery?

That's my understanding of what the service technician said. When I asked him which software update caused the battery problem, he suggested a revision but wasn't very sure about it.

 

[ebmcs03]

So out of curiosity, does the model 3 only charge the 12v battery say at home while the car is plugged in or does it do it while driving similar to an ICE car/alternator? Are people having this 12 volt battery issue making only short trips? I know my daughter had an issue years ago with short trips in her car and the alternator needed longer to fully charge the battery not sure if Tesla’s work the same or not?

The main battery pack charges the 12V when it needs to.

 

[XLR82XS]

Is this the Model 3 equivalent to the "12V Battery Needs Service" warning that's shown on the Model S60D screen in the article?
Seems like the message on the Model S is much more specific and calls for a clear action.

What did Mobile Service do to fix the problem in 10 minutes?

 

[Firedog7881]

Did you ever measure the battery voltage?

I have a 2018/10 Model 3 and my battery still looks charging fine (see previous reply #11)

I have a Cigarette Lighter Splitter with a Voltmeter so I can easily check my car battery voltage.

Also I use the App 'Scan My Tesla' to get additional voltage and capacity information.

No, I never checked it. I did reset the car by disconnecting 12v and main battery from disconnect under rear seat. The errors came back the next morning, replaced the battery and haven’t had a problem since.

 

[Firedog7881]

That's my understanding of what the service technician said. When I asked him which software update caused the battery problem, he suggested a revision but wasn't very sure about it.

Sounds like I should get my money back for my battery. How are they going to do this for cars that get updated and are out of warranty like mine?

 

[dave999z]

So is there going to be a TSB to proactively replace the 12V on all Model 3 vehicles that were running the damaging software version for X amount of time. Or do we get to just wait until the car is dead one morning. And hope that happens before warranty is up.

 

[Jazz_MIII]

I wonder if we can be proactive and request a service appointment for our batteries to then nudge Tesla to see if our cars would be affected by the battery issue in the future? I have not experienced this yet but have read about it quite often on these threads!

It would be nice to be able to fix prior to receiving the DEATH notice, lol.

 

[Atari2600]

Can you check the fluid level in these batteries? I wonder if they overcharged the batteries and boiled off the distilled water?

 

[AZAV8R]

Can you check the fluid level in these batteries? I wonder if they overcharged the batteries and boiled off the distilled water?

To my knowledge, no. These are sealed AGM units. Yes, you can disassemble it, but I don't suggest it.

 

[jkdman123]

I wonder if we can be proactive and request a service appointment for our batteries to then nudge Tesla to see if our cars would be affected by the battery issue in the future? I have not experienced this yet but have read about it quite often on these threads!

It would be nice to be able to fix prior to receiving the DEATH notice, lol.

I’ll give you 3 guesses about how far you get, and the first 2 don’t count.

 

[TraumaDoc]

I have been monitoring my 12 V battery for the past week. I noticed the following:

1. About every one day 1/2 (about 33 hours) the battery get charged for about one hour at 14.60 V

2. Detail of the battery been charge at 14.6 for about one hour.

3. The battery discharge slowly from 13.20 V to 12.70 V (or about 0.5 V) during the next day and 1/2.

I noticed several pics of about 50 mV lasting 10 to 20 mS, and I suppose those correspond to an electrical pump starting since the car was sleeping.

If you look, the minimum increment on the measurment looks to be 50mV and all of those pips happen in the latter half of the step on the graph and get closer together the nearer the end of the step you get, and actually some up-ticks after the dense section, its more likely that the voltage is dropping constantly over time, but that there are small fluctuations that cause it to bounce between two readings on the scale.

 

[EnrgyNDpndnce]

Sounds like I should get my money back for my battery. How are they going to do this for cars that get updated and are out of warranty like mine?

If you’re out of warranty you have no claim. To quote Willy Wonka, “You get nothing! You lose! Good day sir!”