Maybe you should carry a replacement in the trunk just in caseSix and a half years and 140,000 miles on my original S75D 12v. I thought about preventative maintenance, but at this point, I’m kind of curious how long it will go.
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Maybe you should carry a replacement in the trunk just in caseSix and a half years and 140,000 miles on my original S75D 12v. I thought about preventative maintenance, but at this point, I’m kind of curious how long it will go.
Yeah, once you've been bricked, it kind of handles the curiosity factor for you lolSix and a half years and 140,000 miles on my original S75D 12v. I thought about preventative maintenance, but at this point, I’m kind of curious how long it will go.
Then they will likely charge you. I replaced mine last month (3 years mark) and asked the SC to preemptively replace it. They said mine didn't have any battery warning message and will not be replaced for free under warranty.Next March my Y will be 3 1/2. Low miles. Would love it if they would preemptively replace the 12V battery before it exceeds the 4 yr warranty at no cost.
No indication there is any current issue with the battery, however.
My 05 Prius (recently sold it w 360,000 miles on it) 12V battery failed every 4-5 years here on Long Island, NY.It's strange how Tesla 12V battery dies after 2-3 years while my Prius 12V still runs strong after 9+ years..
I always preemptively changed 12V batteries on my ICE cars beyond 4 years. I just didn't need that drama in some parking lot on a cold, rainy night, and they're fairly cheap. I usually did it myself on my terms and time, in good weather - old battery got recycled, no big deal.I bought a used from Tesla 2019 TM3 and 2021 TMY this year. I had both 12V batteries preemptively changed. The price of the Lead Acid battery is just too cheap to risk being stranded. I have a 2 year old that commutes with me to work (his daycare is at my job) I’m not going to get stranded with him, especially with NY winters. I keep A23 12v batteries in a cut rubber glove zip tied to the 12v jumper under the toe hook cover.
For the price, it’s totally worth it to change the 12V every 3-4 years.
I’d rather waste a little money, than have my son be uncomfortable, or worse, in danger just to save $125.
my 18 prius prime 12v died after 4 years(avg life on 12v it seems now).While true, the 12v battery in a Prius will last 9 years. That doesn't mean you shouldn't replace it sooner. My 3rd gen prius fuel mileage decreased at about 5 years. It turned out the 12v battery was the culprit as the gasoline engine would have to turn on and run more often. The prius does not have a starter for the engine, instead the computer instructs the electric motor to use power from the traction battery to start the engine. So the 12v system can operate just fine even with a very weak battery with low capacity. It just means when the voltage drops low more often, then the engine will need to kick on and run more often, lowering your fuel economy. This is well known with Prius's. Basically with the car turn off and the battery resting for a few hours, check it with a voltmeter. If it's at about 12v, then it needs to be replaced for optimal fuel economy. Needs to be at about 12.3v minimum after being fully charged and resting for a few hours. 5 year is the average for these batteries when looking at fuel economy. But the car will still operate fine for many more years with the battery at low capacity.
You were bricked - welcome to the club. This is ridiculous Tesla needs to fix this — engineers are you out there?!My 12v battery died yesterday (Sunday) WITHOUT WARNING on my 2020 MYLR. Short version: my car was stuck outside, with the driver window partially open, and the car would NOT drive. With the rain in CA yesterday, it was a total nightmare. You absolutely can get stranded if the 12v battery dies.
Here's the full story on another thread: 12v question
My MY is 3.75 years old, (68K miles) and I walked into the Smithtown, NY service center last week, where the underwriter told me that there was no reason to change the 12v battery in the absence of error messages on the screen. I scheduled it anyway (along with electively scheduling the HEPA mod and upgrading the repeater cameras on both sides) and doing it all will reportedly by $850.00, tax included. It’s scheduled for tomorrow morning. This is the only maintenance I have put into my vehicle in the past 12 months, and I feel that in doing so I am optimizing safety and reducing the likelihood of getting stranded.I bought a used from Tesla 2019 TM3 and 2021 TMY this year. I had both 12V batteries preemptively changed. The price of the Lead Acid battery is just too cheap to risk being stranded. I have a 2 year old that commutes with me to work (his daycare is at my job) I’m not going to get stranded with him, especially with NY winters. I keep A23 12v batteries in a cut rubber glove zip tied to the 12v jumper under the toe hook cover.
For the price, it’s totally worth it to change the 12V every 3-4 years.
I’d rather waste a little money, than have my son be uncomfortable, or worse, in danger just to save $125.
My MY is 3.75 years old, (68K miles) and I walked into the Smithtown, NY service center last week, where the underwriter told me that there was no reason to change the 12v battery in the absence of error messages on the screen. I scheduled it anyway (along with electively scheduling the HEPA mod and upgrading the repeater cameras on both sides) and doing it all will reportedly by $850.00, tax included. It’s scheduled for tomorrow morning. This is the only maintenance I have put into my vehicle in the past 12 months, and I feel that in doing so I am optimizing safety and reducing the likelihood of getting stranded.
@dude7, @JayPaul Agreed. Clearly the EV world is not without occasion speed bumps and landlines. It’s good to avoid what hazards lie ahead if you can.@ArtK, @JayPaul, we're already acquainted here. You should be glad you replaced/are replacing the 12v battery before it's too late. The number of errors I got when the 12v battery died was stupid. I took screenshots when they occurred and you can see them here: 12v question
I think one thing that really hurts EVs with the 12v battery issue is that ICE cars tend to give you some indication that the battery is failing. You know, generally, that it’s taking a little longer to turn over than usual, that something isn’t working exactly right. Now, that’s not all the time, but most of the situations where I’ve had a battery fail it was fairly obvious that it was failing for at least a few days before it did (sometimes more like a month or more, I just didn’t do anything about it). EVs don’t give you that same level of indication, there is no “oh, the lights dimmed really weird there when I started the car,” or “oh hmm, starter usually only goes for a split second, that’s not right” moment to see.
Fair point about it being less true. And temperature changes can have a pretty dramatic impact too. A battery that will start just fine when it’s 75F might not when it’s 15F!This is true, but has become less and less true. Even ICE vehicles have tons of computer systems these days. When they go, they can immediately go. The difference with EVs (I only have experience with Teslas) is it seems we can’t just easily jump and keep driving.
Tesla should find a way to use the HV battery in place of the 12v battery once it dies. Then let the driver that the 12v battery needs to be replaced.
For safety reasons (and probably regulatory too), the HV battery has to be isolated when the car is "off". Which means you need a power source to run whatever mechanism connects it to the rest of the system (a high-current switch of one type or another).Tesla should find a way to use the HV battery in place of the 12v battery once it dies. Then let the driver that the 12v battery needs to be replaced.