And if Tesla doesn't have one in stock, or it isn't convenient to get there, you will probably find that it is one of the standard form factors. The one in my 2029 Model 3 was a Group 51R form factor, and I replaced it with a Diehard 51R-AGM as my closest Tesla Service Center didn't have the Tesla one in stock, and I didn't want to risk having an issue on an upcoming long road trip.
Kevin > On Jul 29, 2025, at 00:07, (-Phil-) via EV <[email protected]> wrote: > > It depends; a lot of people have had the car go dead in the night and need > a jump. I think Tesla recently patched the software to just not sleep > when that alert is set, so you'll just end up losing a lot of range every > day if you don't. > > It's only $100 from Tesla service. Part # 129182-00-B > > > > On Mon, Jul 28, 2025 at 9:38 PM Cor van de Water via EV <[email protected]> > wrote: > >> Note that you absolutely do not need to hurry to replace the aux battery, >> the only thing "wrong" with it is that the Tesla needs to wake up its DC/DC >> converter more often than the software programmed minimum time, indicating >> that capacity is below desired limit. >> I got rid of the warning by swapping the battery, then used the old battery >> in another of my EVs that does not complain about capacity. >> YMMV. >> Cor. >> >> On Mon, Jul 28, 2025, 8:15 PM (-Phil-) via EV <[email protected]> wrote: >> >>> VCFRONT in the Tesla monitors the amp-hour capacity of the lead-acid >>> battery. When it drops too low, you get that alert. >>> >>> To change it, disconnect the negative terminal, then go into service mode >>> and stop 12v support. If you don't do this the alert will stay until you >>> do. >>> >>> On Mon, Jul 28, 2025 at 7:21 PM Jay Summet via EV <[email protected]> >>> wrote: >>> >>>> I would not be surprised if it is almost dead. 5 years appears to be >>>> about the standard runtime for most car accessory batteries. [I've had >>>> the one in my Leaf and a Nissan Altima both die around that >> timeframe..] >>>> >>>> >>>> I don't know if the Tesla system is doing a calendar reminder, or if >>>> they are doing diagnostics based upon the battery voltage and capacity. >>>> >>>> Jay >>>> >>>> On 7/28/25 21:27, Mark Hanson via EV wrote: >>>>> Hi Folks, >>>>> >>>>> I got an alert on my 2021 Tesla-Y app to change the 12V aux lead >>> battery >>>>> after about 4.5 years 126K miles of operation. >>>>> >>>>> It looks like I need to go into the menu>service>PowerOff selection >>>> before >>>>> just plucking out the battery. >>>>> >>>>> In the 2013 Leaf I just changed the 12V battery without fanfare. >> Also >>> in >>>>> the 2020 Bolt after 5 years of operation. >>>>> >>>>> Is 5 years the recommended aux 12V change interval? - or should I do >> a >>>> load >>>>> test first before just changing it at a fixed time/mileage interval? >>>>> >>>>> >>>>> Have a renewable energy day, >>>>> >>>>> Mark >>>>> >>>>> Mark E. Hanson >>>>> 184 Vista Lane >>>>> Fincastle, VA 24090 >>>>> 540-473-1248 phone & FAX, 540-816-0812 cell >>>>> REEVA: community service RE & EV project club >>>>> Website: www.REEVAdiy.org (See Project Gallery) >>>>> UL Certified PV Installer >>>>> My RE&EV Circuits: www.EVDL.org/lib/mh >>>>> REEVA Demo: http://youtu.be/4kqWn2H-rA0 >>>>> Fincastle Solar Weather Station >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Address messages to [email protected] >>>>> No other addresses in TO and CC fields >>>>> HELP: http://www.evdl.org/help/ >>>>> >>>> >>>> _______________________________________________ >>>> Address messages to [email protected] >>>> No other addresses in TO and CC fields >>>> HELP: http://www.evdl.org/help/ >>>> >>>> >>> -------------- next part -------------- >>> An HTML attachment was scrubbed... >>> URL: < >>> >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250728/73470a29/attachment.htm >>>> >>> _______________________________________________ >>> Address messages to [email protected] >>> No other addresses in TO and CC fields >>> HELP: http://www.evdl.org/help/ >>> >>> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250728/3cb3e7b0/attachment.htm >>> >> _______________________________________________ >> Address messages to [email protected] >> No other addresses in TO and CC fields >> HELP: http://www.evdl.org/help/ >> >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250728/fe82e888/attachment.htm> > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
