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How long after a low 12v battery warning?
- Thread starter Droschke
- Start date
NewbyMaybe
Newby1Kenowby
ATPMSD
Active Member
Turn on Sentry and turn off all exclusions. When Sentry is on the car does not go to sleep. When the car is awake the 12v system is powered by the DC-DC converter from the HV battery. The 12v battery is not used, only charged.
If your car is under warranty the replacement will be for free. There are a lot of negative posts about the Ohmmu battery, some because Tesla does not “support” the battery and others about a reduction in quality. If you are considering the Ohmmu just do your homework.
ATPMSD
Active Member
Hmm. So I see you have a 2015 car. Pretty sure you can turn on ”camp mode” before leaving the car and it will accomplish the same objective of keeping the car awake. Just turn off the HVAC.
You can also call the parts department and order the battery, then pick it up. Pretty sure you can also order one through the app. There are plenty of YouTube Videos on how to replace the battery, pretty easy DIY.
The Tesla battery will be relatively inexpensive. I found this solution as well, but I have no personal experience to offier:
High Capacity Dual Purpose AGM 12v Battery for Tesla Model S
No International Shipments Ships directly from vender via FED-EX Â 12v Full Throttle Battery by Fullriver Battery for your Tesla Model S Replacement for 6007898, 1024463-00-A, 1083774-00-A, 1480221-00-A Important fitment information** 2012-3/2016 RWD Cars require adapter post which we...
evtuning.com
ATPMSD
Active Member
Only the cost of a new battery.
Pretty sure profile settings are contained in Non-volatile memory (NVM). If not, I think we wold have heard a lot of complaints by now since it is important to ensure the HV battery is not supplying power to the 12V system when changing the battery.
Last edited:
airborne spoon
Active Member
No reason to replace something that's not broken, and no you don't lose anything when you pop the battery out, even pulling the firemans loop doesn't get rid of your settings or profiles. All that crap is stored on the MCU on non-volatile memory just like your computer at the house if you turn it off and unplug it from the wall everything is fine because its all stored on non-volatile storage (SSD, hard drive, M.2, etc.)
I've gone 25 days from when the replace the 12v warning came up till i got a chance to actually replace it. you can just buy the battery directly from tesla its $165 PN: (1083774-00-B) swapping it out takes like 10 minutes in the driveway.
Thanks for the update and info. Sounds easy enough. I guess my concern is/was that I have read other reports and user reports on other forums that indicate that in some cases, it’s often hours and not DAYS between getting the warning alert and the vehicle not being able to be used? Could be corner cases, could be user error / lying / exaggerating for sure. It WOULD seem however, that whatever battery was in these early days cars from 2017/2018 does seem to fail before I at least would expect them to. Being 4.6 years out from delivery at this point, I’m probably ok with the cost now, today vs. most likely a little bit later in time.
airborne spoon
Active Member
I've replaced the battery 3 times that i can remember and its usually about 1.5 years after i replaced it the last time. Its likely my DC to DC converter is taking a dump and overcharging it, thus causing it to degrade faster. but since i have to pull the HV battery to replace the DC to DC converter and the fact that thing is stupid expensive I'm just rolling with it till it breaks fully.
I have a model 3 with a lead acid 12v. I got a 12v battery alert and didn't replace it for almost a month after. The alert just stays on your screen and phone. They fixed all the 12v issues with software updates. I haven't seen any recent posts of someone's just failing or the car turning off.
NewbyMaybe
Newby1Kenowby
It's good to hear the 12v brick issue is in the past. Scary and frustrating to be stuck on a road.
NewbyMaybe
Newby1Kenowby
Yea I got a push alert on my Tesla app also. Then it had a schedule service thing to push. You might not have it because you already scheduled the 12v battery replacement.
If you send Tesla a chat message they will move up your service date and schedule it for roadside rather than at the service center. It only takes 5mins to replace the 12v so they do it mobile and fit it in. If you added anything additional to the service date that could be why you have such a far out date.
I was hoping you wouldn't bring that up since it raises my blood pressure
I've sent them multiple messages. No responses to any of them.
I've asked to get an earlier mobile service (they still show the SeC as the location) - no response.
I've asked them to correct the only message they have sent which was an erroneous invoice to approve that has $200 deductible added for the ESA coverage (my extended service warranty). No response.
Also, the funny thing is that the ESA does not even cover 12v replacement, and even if it did the connotation is that being under ESA costs you $200 more than being out of it!!!
Unbelievable lack of communication and just flatly ignoring the customer inquiries.
If you just sent them the messages it normally takes them days to reply.
The initial invoice they sent you is probably just automated. They will fix it eventually.
12v batteries are normally not a warranty item. It is strange that Tesla covers them to begin with under the regular warranty. However 12v batteries do normally come with their own manufacturer warranty so I wonder if Tesla covers them because they send them back to hankook. If you were to buy a hankook battery from a store it comes with a 4 year warranty.
The initial invoice they sent you is probably just automated. They will fix it eventually.
12v batteries are normally not a warranty item. It is strange that Tesla covers them to begin with under the regular warranty. However 12v batteries do normally come with their own manufacturer warranty so I wonder if Tesla covers them because they send them back to hankook. If you were to buy a hankook battery from a store it comes with a 4 year warranty.
I thought I'd cross-reference a thread I made earlier this year when my low voltage message came across the IC:
teslamotorsclub.com
Basically no one knows who long the 12V battery will last; seems to last longer on the older Model S cars but there appears to be an issue with possibly the QC of the 12V battery and duty/overcharging of the 12V system.
As for replacing the DC-DC converter, I found that Hybrid Revolt does a core-swap and repair of the 1st gen converters for ~$255 which is a nice alternative. I haven't heard of any reviews but at least it's an option:
Any chance we can get a sticky thread for the 12V battery?
I've got a 11/13 built S85 with the MCU2 upgrade and have finally had the "12V battery low" message pop up after 112K miles. Tesla has preemptively replaced the 12V battery twice before, one when the HV contactors were replaced under warranty and the other time rear window defroster was fixed...
teslamotorsclub.com
Basically no one knows who long the 12V battery will last; seems to last longer on the older Model S cars but there appears to be an issue with possibly the QC of the 12V battery and duty/overcharging of the 12V system.
As for replacing the DC-DC converter, I found that Hybrid Revolt does a core-swap and repair of the 1st gen converters for ~$255 which is a nice alternative. I haven't heard of any reviews but at least it's an option:
Tesla Model S Gen 1 DC-DC Converter Repair [TeslaG1-DC-DC] - $225.00 : HybridReVolt: Hybrid Battery Repair
HybridReVolt: Hybrid Battery Repair Tesla Model S Gen 1 DC-DC Converter Repair [TeslaG1-DC-DC] - This is a repair service of your existing DC-DC converter from early (2012-2013) Tesla Model S vehicles. You will need to remove and ship your DC-DC converter to us (US zip 85379), we will repair it...
www.hybridrevolt.com
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