Tesla Motors Model S -- Dead 12v Battery -- What to do to get back up and running (Roadside Service)

Tesla Motors Model S -- Dead 12v Battery -- What to do to get back up and running (Roadside Service)
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A Good Jump Box can be found here: amzn.to/3Or9LqE
The Tesla Model S is one of the most advanced vehicles on the road. Yet, it still uses a old style 12v Lead Acid battery to power the Auxiliary Electronics, as well as used to "wake the car up" when it's time to drive off.
If your 12v Aux battery dies, your stuck. This video will show what to do to get your Model S running again to save you from a Tow Truck Ride.
/ kmanauto
/ kmanauto
www.SuperchargerTravel.com
~~~
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[@AshishRaniwala]

This video was a life saver! I couldn't believe that the service shops told me that I need to tow the car to them -- there is no other way. But your video got the car all working again! Thank you.

[@Carsporttt]

10 years later, vid is still saving lives. Thanks!

[@KmanAuto]

My pleasure!

[@nvan8406]

Thank you! My Tesla would not wake up! Tesla told me to tow it in! BTW I’m a 50+ female and your instruction was super clear & easy.

[@KmanAuto]

my pleasure, please like and subscribe to return the favor!

[@randygreen7871]

Great video, thank you so much for posting it!

[@wsmith5204]

Thank you for this. It brought my Tesla back to life.

[@KmanAuto]

Quite welcome! You can return the favor by liking and subscribing! :-)

[@maheenmirxa]

You just saved my graduation. I have a graduation today and I put in all my graduation stuff in the car and this morning my car wasn't opening. This video saved my graduation

[@KmanAuto]

Glad I could help! Please like and subscribe to return the favor! It helps Tremendously!

[@1pfeifits]

Just wanted to thank you for this video. I was able to fix a sensor in my 2015 model s by removing the nose plate to actually reach it.

[@jameshennighan8193]

Thanks for your reply.Glad you got things sorted out......Kind regards.

[@bigzo9867]

Thanks, this was great information..

[@DJGarcia]

Came in clutch for me this weekend! My 2013 P85 does have a cover on the pos terminal - Thank you!

[@pol1250]

Damn go on!! How can you be so slow explaining something???

[@therashaunb9711]

pol1250 don't do this it will break you're clips

[@richardtrotman1816]

haha that was my thought... PICK A F'N CARD TO USE ALREADY!

[@robertmontgomery7158]

Nicely done!

[@bigkarl24]

I recommend have a spare scre w driver nd a small micro fiber town nd wrap it around the screw driver nd try to start pulling it off its hard nd still protect the paint with the micro fiber town wrapped around

[@JOHNINCOLUMBUS]

I had no idea Tesla had an additional 12 volt battery, I thought the main battery pack was the only power source. Thanks for the information.

[@Ownlyfinds]

Thanks a lot brother, this video saved my life aka a lot of money

[@KmanAuto]

My pleasure! Please like and subscribe to return the favor!

[@EddieDexterStewart]

I had no idea the Model S had a 12V battery. Very informative! Keep more Tesla Model S goodness comming!

[@kavemanbites]

thanks for your many vids on Tesla. do you happen to know which terminals are Pos and Neg for Supercharging at the charge port??

[@KmanAuto]

***** No, sorry. And don't screw around with it. DC is much much worse then AC. DC doesn't let go! If you really wanted though. Inside the trunk, directly behind the charge port is a carpeted flap you can remove. The thick chargeport wiring is right there.

[@incoming00]

Pretty simple and straightforward forward, guess I'm moving my portable starter to my frunk now lol

[@zzzztau]

lv system in an electric car consists of safety circuits and other electronics. before the HV battery turns on, the safety electronics needs to check the conditions of HV battery so that's why it needs another source. After the HV battery is checked by the safety circuits, the 12v power is supplied by dc-dc converter I believe. that's how we designed formula student electric car so I guess tesla has the same design

[@bhuvanandrakumar2691]

Thank you for the tip!

[@KmanAuto]

Happy to help!

[@EsenbekAliev_]

I wonder if you can remove that chrome surrounding after noscone is removed.... ?

[@mblake0420]

that looks fun to change

[@robertjones7565]

Later models of the S don't have the removable fake grill, how does one jump them?.

[@kaigroschi5852]

Can anyone tell me why my 2015 Model S doesn't have that red marked access port??? Please advise.

[@marcwiesen]

If the 12v system fails the frunk won't open. What you see is just a post and not the battery it self. The battery is mounted somewhere else and they made a post there with a cable to the battery for an emergency. greetz

[@pixelum2023]

Tesla should definitely put these battery posts in a more accessible place. How about a small cover inside the "frunk" somewhere? Removing the nose cone in -20°C weather would be a lot of fun!

[@KmanAuto]

I've done it (Installed my Light Up T on the nose cone). Took all of 3 seconds and a single credit card to pop it.

[@Robertdesterk]

Tnx man nice video, im not electric cars fan, im still old school benzine cars but i see so many tesla where i live they even became Taxi's, therefore start thinking about getting one, my question if u run out of power how long do i have to charge it to drive again? What is the mileage? Kind regards

[@KmanAuto]

depends what you plug into. In order to drive it at all, anywhere from 30 seconds to a hour. Depends, plugging into a 120v outlet, or a supercharger that can recharge the pack in 20-40 minutes, or 66 hours on a 120v outlet. range is 200-300 miles depending on if you get the small or big battery.

[@Stots714]

once you have the nosecone off slightly at the corner; you can grab it from the bottom to pull it out evenly

[@geobely]

i like to see your complete setup for home charging what have been working best for you

[@KmanAuto]

Just a simple 14-50 outlet :) I did install a HPWC, but RARELY use it.

[@outdoorsman0331]

This is a nice video, but the nose cone on the bottom has a place to put hands and push up on tabs and cone pops right off.

[@user-nh6vo3vk6e]

Great tutorial. Thank you.

[@KmanAuto]

Glad I could help! Please hit like and subscribe to return the favor!

[@user-nh6vo3vk6e]

@@KmanAuto I tried credit cards (2) thick enough but did not work. They bent and I used the tool for removing cars retainer clips and it popped out. Thats probably because my car is a 2013 and a bit old.

[@KmanAuto]

@@user-nh6vo3vk6e Could be. I like the credit card as not as likely it will be damaged. Though, you are right, after 11/12 years, if it's not done regularly, those clips can rust a wee bit and get tight. Either way, Glad you got it and I'm Glad I could be of assistance!

[@martinsoendergaard-jensen9602]

What happens if you have a Tesla with the flush front?

[@aug8241944]

I wonder if this is the battery that caught on fire on a tesla recently on a video on the enternet

[@Apollo9733us]

With my Tesla, whenever I go on extended trips I carry a 2000 watt Honda Generator, its compact, very easy on a gallon of gas and its more then enough to get you back on the road to a charging station, its not fast but will do the trick in a pinch

[@jackdavids2723]

That's good thinking

[@daveriley6310]

There are even smaller and lighter portable generators available. But I've found none as efficient as the Honda EU2000i. 9 or 10 hours on 1 gallon of gasoline at 1/2 load; less if the full 1600 watts of continuous load is required.Plus the electricity produced is of a high quality due to the inverter process built in. No, I'm not a Honda shill, just a sailor who likes small light generators to supplement the solar when needed.

[@KmanAuto]

Ironic you say that, I just tested the IQ2000 by Generac, and the EU2000 by Honda TODAY! I have a whole series of videos uploading, RIGHT NOW. Please watch once they are uploaded and live (Ready tomorrow). Short story though, the Generac IQ2000, is quieter, more fuel efficient, AND, most importantly, plug and play ready for Tesla Charging, where as the EU2000 will require a "Generator Hack Plug" to trick the car's ground safety to allow charging.

[@JimButchart]

My Tesla is now one and a half years old and I got the "12 volt battery needs service - replace battery soon". The car is charged every night and has never been run to flat. I called Tesla service and they are coming to my home to replace the battery. The problem is I have to wait a couple of days and was told to not drive the car. I have other cars but this is really a weak link in this otherwise great car.

[@JimButchart]

Tesla replaced the battery no charge. I was told they were bad from the supplier. No issues since.

[@rickdeckard9810]

+Jim Butchart Why must you wait a few days exactly, for the 12V battery to fully charge?

[@JimButchart]

The two day wait was for Tesla service to arrive at my home. The 12v battery will not charge. That is the problem. By the way this was taken care of long ago. I'm now on my second Model S.

[@theblukatlife]

Your Second!! 😨 I cant even afford one. You should have called me, I would have swaped that battery in no time. Even thou I dont have a Tesla. I am a problem solver. Give me a job ☺

[@mikerhinos]

The guy was following a truck that lost a big piece of metal and ran over it, it made a hole in batteries that took fire. But the car seems to be pretty well made and fire didn't completely burnt the car down in a few minutes like a gasoline car would. Nobody was hurt, and that's what count I guess.

[@TimeHopeFaith]

I think it's smart to not have everything running off of one main power. All the draw in current from the main battery and the shift in consumption can really affect performance.

[@KmanAuto]

+Dennis Mathias It wont work. The car would need to be fully powered up before the 12v outlet works. Now if it's one that has jumper cables that you can clamp directly to those terminals, then your good to go.

[@DennisMathias]

***** Just came back and looked at this. If you go to my link, you'll see the alligator clips. They talk about jump starting an ICE vehicle with this..so I bought one. And a S85D too! Wish we could have won the model x contest for you!

[@KmanAuto]

Nice. Yah, too bad :( It would have been awesome to no end. Just itching for that good ol wisconsin tractor pull.... Still, just one referral.... cant understand it :(

[@rogerheuckeroth7456]

Kman - Do you know if these terminals go strait to the 12V battery, or are they fused? I'm down south and we are getting ready to hunker down for Hurricane Irma. In case we loose power it would be nice to use my 85D with an inverter to power my fridge and a few misc loads. I calculated a 1500 Watt inverter could run my fridge/freezer for days. I read that the DC/DC converter is rated at 2500 watts, so it would seam that running a 1500 Watt inverter right off these posts should not be a problem. I do have a camping generator that will do it, but I hate to have to run that thing 24 hours a day feeding it gas. Hopefully, Irma will miss us, or power will stay on, but just want to be prepared .

[@dennisclarke8866]

KmanAuto i

[@GaryAKline]

Makes sense to have a 12v lead acid battery to be compatible with all charging systems. You don't want a system that is incompatible with road side assistance vehicles. What surprises me is that the front panel is not hinged with a locking mechanism released from the inside. This means ANYONE can pop off that front panel and either drain your battery or maliciously short it out (Tesla ownership jealousy). Given you pay $60k for this vehicle, another $200 added to the price for decent security access to the battery would be a no-brainer.

[@babybirdhome]

But to do that, they'd need door handles that don't require power to be accessed, and they'd need to be mechanical latches instead of electro-mechanical, and there'd need to be a keyhole and a physical key to unlock the door. It's probably pretty safe without adding those things and losing the neat features of the Tesla, since it's unlikely that anyone would go to so much trouble AND know how to do this AND not get any funny looks about messing about with a car in a parking lot where they're not getting in or out of it or opening anything.

[@richardtrotman1816]

You can't get inside the vehicle is the 12V is dead.

[@solarstacks]

Do you know how high the voltage has to be to get the Tesla back up? Mine goes to 13.6 but won't go into D or R still saying the 12v battery is low.

[@nicholaslandolina]

solarstacks Probably around 12.8v

[@dennisl6198]

dont be afraid to to the battery replacement yourself. it took me 20 minutes with just a couple of simple tools.

[@ThinkingBetter]

Yes, exactly. This front piece assembly seems a bit conceptually cheap.

[@xrayangiodoc]

Let's say that your window was down when the 12V battery died. Could you, "Jump it" with one of those boosters that you plug into the accessory outlet? Or is the accessory outlet not connected when the power is off?

[@KmanAuto]

No, the accessory outlet is computer controlled, and does not come on unless the car is "on". This is to prevent people from leaving things plugged in that may drain the 12v (and then the High Voltage Pack) by accident.

[@richardtrotman1816]

There's no cigarette lighter type accessory outlet. Just 2 USB slots for charging, game controllers, or a USB drive filled with MP3s

[@xrayangiodoc]

@@richardtrotman1816 MY 2014 Model S85 has a 12 volt accessory outlet. I have used it to power thermoelectric coolers and other items.

[@sae1095hc]

I wonder if that positive terminal is connected directly to the 12V battery or if they put a diode in line? Otherwise some jerk could just pry off the nose cover, "short" the terminals and fry your accessory battery and disable your Tesla.

[@KmanAuto]

Wow, had never thought of that before. I will ask someone at highland, but I think it goes directly to the battery.

[@TheElectr0nicus]

Without knowing the exact construction of the tesla, I can say that car electronics are really robust. I think they must be by law. So all the car electronics must have reverse polarity protection, over voltage protection (up to 48V) and have to stand that indefinitely. Also the need to have protections against shorter events, like a over voltage spark from ESD etc. Those electronics are extremly rugged, and not easy to damage, at least not by some random jerk. A Diode in series would not be very likely because of the voltage- drop at high currents, a transistor based reverse polarity protection is more likely.

[@jameshennighan8193]

Would be a good idea to provide some isolating insulation on both these terminal. The positive (red) would benefit from a battery isolation cover. Not too expensive from an auto accessory shop...........Whilst the negative, (black)....which appears to be just a protruding threaded stud...............can be easily covered with a length of rubber or plastic hose......................or even the outer sheath, (insulation), from a length of cable. You could, of course just choose to insulate / isolate one of the terminals. The negative (black), would be the easiest and would take only seconds. Best thing would be a tight fitting length of outer sheath insulation or hose..................tight fit and with some grease in it for good measure........

[@KmanAuto]

+James Hennighan They were supposed to have caps. Tesla "Forgot" to put them on at the factory. I have them now, picked em up at the service center.

[@KmanAuto]

+James Hennighan And it's only needed on the positive terminal.

[@dlwatib]

I'm surprised that a Tesla has a conventional 12V lead acid battery. Since it shouldn't need a lot of power to run the electronics, I would think they would want to use a lighter battery, maybe a half dozen 18650 cells in a mini-pack. After all, that's what 18650 cells were originally designed for. I'm also surprised that they would bury the lead acid battery in an inaccessible place where it's not easy for an owner to replace it. It's one of the few things an owner should be able to service on the vehicle.

[@KmanAuto]

Simplicity and reliability of a properly designed deep cycle AGM, and off the shelf replacement in case of error.

[@clonatul1]

why do you need the 12v battery in the 1st place?

[@Mladjasmilic]

This positive pole sticking with no cover - that can make such nice sparks in event of crash . I think that it would be safer to put it in the 'frunk' near washer fluid cap or something with 4 cents worth of cover .

[@richardtrotman1816]

The problem is that you can't get into the frunk if the 12V battery is dead.

[@solarstacks]

you lucky if you only have to jump it. Ours was a big cost and problem that shows as a low 12v battery. our 2012 S 85 has a 12v low battery. It turned out to be a failed magnetic coil for the contactor down in the battery pack. We had to drop the entire battery to find it and replace it. A major job and expense not under warranty.

[@davidbryant2872]

A Tesla technician showed me that it is easy to pop out the nose cone by sitting on the frame above it, which distorts it enough to loosen it. Just hold onto it to avoid damaging the sensor wires. (The car in the video is too old to have the parking/AP sensors that later cars have.)

[@KmanAuto]

if the 12v is dead, you can’t open the frunk to sit on it to pop the nose cone without already having the cone off

[@KmanAuto]

@Matt P If it’s a nose cone car, take off nose cone, use screw driver to pop hood by stretching the frunk cable on mechanism. Some early model s’s had a manual drink release lever by the passengers foot well, on the inside. If it’s a refresh model s design, MX, M3 or MY, there is an external pull cord by the front grille, basically this means the drunk is NOT a secure compartment.

[@sarfrazashraf5912]

What If your 12Vbattery says replace battery, But Its not dead yet, can you just recharge it with the charger and don’t need to replace? My trunk opens and close normaly, But In the app and Its open, and gives beep beep sounds, is it because of the 12V battery, autopilot is off too? Seat belt at the back right side is wet when pulled out to wear?

[@KmanAuto]

When the car says to replace, your going to want to do so ASAP. The battery is already worn and capacity is lost. It will no longer take a charge. The car will mostly be operating through the DC to DC converter and you may notice excessive range loss after vehicle is parked. This is due to the car staying awake to keep the dc to dc converter going. Once the 12v gets bad enough, it will discontinue doing this, the car will then not be driveable, and you may no longer be able to open your doors or access anything. We seat belt, if your vehicle has a sun roof that opens, it may be leaking. Your vehicle needs service ASAP

[@sarfrazashraf5912]

@@KmanAuto Thank you Very much sir👍

[@sarfrazashraf5912]

@@KmanAuto Thanks, i had my 12v changed today by Tesla ranger.My back trunk will not go up and down, 1 day before it could.On the screen/app Its upon But In real Its closed.the close mecanism works.And the autopilot are not Working? Is it beacause of leaking from the sunroof water into wire Tesla has repared the sunroof, Maybe What should i so Pls help 😉

[@KmanAuto]

@@sarfrazashraf5912 Sounds like something shorted out. You could try a scroll wheel reset, however, it looks like you will have a service visit in your near future 😞

[@gabesgramofcoke7653]

Hey what’s worse case scenario if it’s not the 12 volt ? Could it be the actual big battery cells that are dead ?

[@KmanAuto]

dc to dc converter or MCU. with a charged 12 V, even if the main battery is completely dead, the screens should still power up

[@bluqbe]

*w/ giddy grin Tomorrow I join the Tesla club, thanks for the good information. Can you please provide the brand and model of that battery charger you used for this video? I've no intention of using but things its a great idea to have it should I ever need it. Thanks

[@KmanAuto]

You can use any 12v float charger. Harbor Freight, Wal-Mart etc... doesnt matter, as long as it says float charger.

[@nicholaslandolina]

Wesley Chandler Dont go with a jump box!

[@buixote]

Is there a "low battery" warning?

[@Malibucompany]

How much range will u get off that 12 volt. How long do u keep it attached?

[@richardtrotman1816]

The 12V is to "start" the car. You don't get any range from it.

[@AshishRaniwala]

Thanks!

[@KmanAuto]

My pleasure! Please consider hitting the like and subscribing!

[@KmanAuto]

Wow! Never got a Super Thanks before! THANK YOU! If I might ask, what was the problem with your car? If it is having 12v battery issues, Here is a how-to, though if you have a older non-autopilot car, doesn't cover that, but gives a good idea. kzbin.info/www/bejne/r2fTaWdseq1nmJo

[@AshishRaniwala]

@@KmanAuto : I have an earlier version with no autopilot. The main battery as well as the 12V battery had discharged, and the car was locked preventing any access or charging. I called up Tesla's roadside assistance, mobile service, as well as their service center, they all asked for car to be towed to a service center. With your instructions, I was able to access the 12V battery and get things going again.

[@KmanAuto]

@@AshishRaniwala Glad I could help! If that 12v was left discharged, PLEASE plan on preventively replacing, that is extremely hard on lead acid, especially the ones tesla uses. I don't want you getting stuck someplace 🙂

[@DailyBeatings]

On another vehicle with the interior panel removed you can see that the positive post has a cap: watch?v=uogM7nZEVXM This the same thing you need to do with a Prius when the 12v battery is discharged, but access to the jump points are little easier to reach.

[@AndrewJamison79]

having the battery posts there must make actually replacing the 12v battery a pain when service has to do that seems they would have gut the entire front half of the car to do it

[@leow_se]

You would thought, such a advance vehicle will has its electrical system more advance and not completely separate motor power, electrical systems.

[@Mayhemm007]

Yeah. This is the only part of Model S I consider to have a bit of a sloppy design. I've heard it still takes a trained technician about 35 minutes to switch out the 12V battery. Many parts have to come off, many specialized tools needed.

[@pedaltheglobe419]

This is why you shouldnt put information online based on "what you heard." You simply open the frunk. Snap off the plastic trim and rubber seal. There are 4 bolts holding the plastic frunk compartment in place. Remove that and the battery is easily accessible. It likely does take a half hour but no specialized tools are needed.

[@firstmm5]

Is this the Proceedure recommended by Tesla, in the manual???? It Seems Very Strange that this would be a solution to a No Start Or No Go situation. The Main battery has Plenty of Electricity, if it us charged, and should be able to top off the 12 volt battery through the onboard Dc to Dc voltage converter!! Is this a Real Issue???? Seriously???

[@Activation1111]

That would a drag if that happen!! It should work like a door with a lock. Because as we can see you may have to get in there at some point.

[@Morphasella]

Hi. May I know what's the range for a fully charged Tesla model s if you drive it aggressive, hard, and fast. Let say 190km/h

[@luciddreams1623]

little late answer, but it's about one third and bit of your normal range, so if you hammer it nonstop at 190kmh, you will have about 190km of range :D (took 9 years to send this answer, isn't the internet amazing)

[@user-lm2bs3nv7h]

can you do this if you're locked out of the car too?

[@KmanAuto]

Yes, that is the whole point.

[@nicholaslandolina]

If all the other battery is dead, what is point of jumping the 12v?

[@richardtrotman1816]

The other battery was not dead. If the other battery was dead, there would be no point in jumping the 12V.

[@Rhaman68]

So incorrect. Grab the bottom section of the plastic cover and tug it out! As to the 12 volt battery life, I am sure there is a need to change this battery after a specific time. Of course, the battery can go bad anytime like all 12 volt batteries can. The 12 volt battery on my 2011 Nissan Leaf lasted 7 years! People, read the car manual!!!

[@brianhall6641]

AFAIK just pressing evenly down on the top of the cone will release it; no screwdrivers or cards required.

[@KmanAuto]

While true, on a new Model S, where the nose cone has not yet been removed, I've found the clips to be much to stiff to safely remove (accept in emergency) without a card or something to wedge in to pry it open a bit. Once it's been removed and replaced one or two times, the clips are more forgiving.

[@aholestol]

Did any of you find out how to Jump start a Model S Facelift with dead 12 Volt battery when frunk is locked ?

[@KmanAuto]

Arvid Holestol yes, video coming

[@aholestol]

Great , thanks a lot

[@magicstix0r]

What's this do to your warranty?

[@KmanAuto]

magicstix0r Nothing, that is how you are supposed to jump the 12v.

[@LARENZFAIR]

***** definitely keeping this in mind. I have a P85 D haven't taken on extreme long road trip but planing to.

[@eddiemoy]

thanks for finally using a tripod. i was getting really sick watching your videos.

[@therashaunb9711]

Do not do this it will break a clip There are lips on the bottom and if you pull on that on each side it will come off

[@benkanobe7500]

What symptom does the car have when this is needed?

[@KmanAuto]

door handles won’t present, dead center screen is a possibility .

[@AndrewJamison79]

Yeah but I wonder if that is one of those repairs that is covered under your warrenty? Elon said he does not plan to profit on service in his eyes service should merely be just that service you pay for the parts and not the service. Unless you having Tesla install something new instead of maintaining the current configuration. This would lead me to question weather a dead 12v would result in them charging you for just a new 12v or not.

[@AlanFrance21]

Yes, and now over 5000 people know how to do it.

[@DarkBioCloud]

I think alot of you are making a big deal out this when its a simple fix by installing some sort of mechanical locking mechanism. Might need to get with a repair center and ask them about it because you want to make sure not to create drag. This is one of the very first versions of the model S ofc there is going to be a few minor bugs to workout I am sure most us can agree that other than minor things like this the car is near perfect

[@richardtrotman1816]

The problem with a mechanical locking system is that you can't get into the car if the battery is dead to access it, if it existed.

[@David-yg8tf]

Lead acid batteries are a serious health damage risk, same as CFL bulbs, yet mandated? Are you serious?

[@nicholaslandolina]

David They are one of the best batteries... How is lead acid as serious of a health damage risk?

[@nschive]

are you saying you can connect this to any tesla like that and it will open? and you can drive it without a key? thats pretty ridiculous if that is the case.. even if there are few of the teslas out on the road..

[@nicholaslandolina]

nschive You cannot start the car without the RFID of the key!

[@richardtrotman1816]

No ... he had the key fob on him or the door would be locked.

[@mikeygirls1988]

The cost for the replacement?

[@KmanAuto]

See my video: kzbin.info/www/bejne/jHqoqq1mm9d3nKs

[@collinreisdorf]

The frunk is likely electrically opened though (like the doors), which wouldn't help much if the 12v battery is dead. BMWs had (probably still have) batteries that were in trunks that could only be opened with a solenoid, so if the battery died, you had to use terminals under the hood to jump them.

[@icisne7315]

I'm confused, why does an electric car have a 12v lead battery when it has a 90kw lithium battery???

[@KmanAuto]

+Phonzo Cisne legal requirements. that way the high-voltage pack can be isolated from the rest of the vehicle in case of emergency, and the 12 V battery is to supply power to your breaking and steering systems so you can still control the vehicle in the event of a problem. Also the high-voltage pack is disconnected when the vehicle is off and the electronics on the car are controlled by an hour from the 12 V. This is all due to

[@WrathChild-NZ]

I didnt even know EVs have 12V batteries. why would you need the battery to start then car though when it has it's own battery? and wouldnt the lithium battery just charge the 12V if it's low?

[@richardtrotman1816]

They still use a 12V for the components gas cars use the 12V for. When you plug your EV in to charge it, it charges the 12V also ... but like any vehicle, if the 12V no longer holds enough of a charge ... it won't start the car.

[@deaftodd]

It's obvious that you spend wisely especially with all those discount cards on your hand.

[@nicholaslandolina]

Todd Cooper Casino cards at that!

[@pangrac1]

Why they dont use 12V Liion battery? Why use old heavy poison acid battery?

[@KmanAuto]

pangrac1 mechanics. the lithium battery would then need to be heated, cooled, and use of special charging system, on top of that, in a emergency it would be more difficult to start it via jump starting

[@ewaldwolk2250]

Actually there are Lifepo4 batteries as exchange which can be just swapped without the need to change anything.

[@ewaldwolk2250]

pangrac1 bike ONLY use 18650 Lithium cells no lifepo4. and using Lithium cells without electronics is very dangerous and minimum can damage the whole pack. its Not about Balancing, more about under and overoltage protection. Dont recommend something to people If you dont know how good the people now about it. lifepo4 batteries even need a Balancer because they Drift more then normal 18650 cells.

[@44444443333333366666]

It seems a bit ridiculous that you can change the 12V on these cars yourself, a battery which is probably very simular to any other car battery

[@KmanAuto]

+Michael A Why would it be ridiculous that you can change it yourself? If you meant that you cannot change it yourself, that is incorrect. Anyone can change the battery, it's just a bit harder to get to. Takes about one hour to do with a socket set. In comparison, it took 2 hrs to change the battery in my parents old Sebring Convertible, and I had to remove a tire.

[@44444443333333366666]

***** Oh, I though that it was something only Tesla could do

[@theblukatlife]

+KmanAuto Oh yeah. Stupid Dodge/Chrysler. The stratuss and I believe the Neon has the battery there too.

[@samuelu21352135]

Hand charger

[@jamesbaxter2812]

So what about the one you cant get off

[@westxtsew]

The Model 3? As of now there aren't any guides; but I would guess that they'd relocate the terminals under the front trunk for better accessibility.

[@SanJo408..]

Right pick a damn card lol

[@ThinkingBetter]

Things that people can easily remove from a car that have a resale value are prone to be stolen.

[@MABOYBLUE]

It helps turn the car on but it still won't start.

[@KmanAuto]

This will power up the computers so you may gain access to the vehicle, and get it in tow-mode if necessary. Or, if the 12v fails, it will get the computers powered up so the DC to DC converter can kick in to support the 12v systems so you can drive home/to service. If the computers power up, and you still cannot drive, it is likely the DC to DC converter is dead, or you have High Voltage Battery issues. What specific error codes is the car showing you?

[@Bronzebk]

Appreciate that knowledge, but my concern was over the plastic cover that hides the terminals, which seems too easy to remove by anyone from the outside w/just a credit card. There should be a release from inside the frunk before it can be removed.

[@richardtrotman1816]

... but you can't open the frunk if the battery is dead.

[@BirdbayEnniway]

No it shouldn't. In case of no power on both 12v and the main battery, it would be almost impossible to charge without braking in to the car.

[@DoorisJ]

omg...now tons of people know how to take the front bumper off a model s

[@Macaframa1]

why they make it so hard to get to

[@KmanAuto]

Because you should almost never need to access it.

[@timleuther2857]

What a poor design. Why there is not a better access?

[@elyKoz]

What if the 12v battery is dead and the car is dead as well?

[@KmanAuto]

use a battery charger to charge the 12v then the car will turn kn

[@elyKoz]

@@KmanAuto okay thank you I have it parked in my apartment complex and the charger is out side the gate my car hit 0% then the 12v died

[@KmanAuto]

@@elyKoz if the 12v has been dead for more than a couple days, you will need to replace it. Lead acid can’t handle complete discharges very well.

[@KmanAuto]

@@elyKoz Tesla Model S 12v Battery Replacement EASY PEASY 20 Minute! HOW TO kzbin.info/www/bejne/jHqoqq1mm9d3nKs

[@elyKoz]

@@KmanAuto I got my 12v to charge up left it on there for 10 min and tried to see if I can take it off and the car went off again. Do you think I should charge it longer to get it in tow mode and then get it towed?

[@mblake0420]

ice vehicle.....how f n nerdy is that LMAO

[@jamesredington4373]

It makes them sound inferior and Teslas superior ( imo not true)

[@ThinkingBetter]

It worries me a bit that this piece of plastic is so easy to remove. Anyone can steal it in seconds and sell it on E-bay.

[@MsSomeonenew]

I guess not everything on the Tesla was designed properly, this part of the car seems to be an afterthought.

[@KSSilenceAU]

***** ***** I have to wonder why they dont use a Lithium 12V Battery such as a LIFEPO4 Battery for the low voltage system, LIFEPO4 is basically a direct droppin for a leadacid but isnt as temperature sensitive, way lighter, and has higher current ability and capacity. If they cant remove the low voltage system, atleast use a better battery lol. (couldnt reply direct to cotxe11's comment for some reason)

[@KmanAuto]

***** Legal requirement that the High Voltage battery is seperated. Now, LifePo4 would be ideal, if everyone lived in the south. Problem with using Lithium for Aux, is that it cannot be charged at or below freezing. Doing so, electroplates the internal of the battery resulting in permanent capacity loss. And since the 12v always has a drain on it, when the car turns on to charge it up, if it's below freezing out, the battery would be damaged. That means, the 12v battery would then need it's own battery heater (AND COOLER!) and warm the battery before charging it, wasting much power.

[@KSSilenceAU]

***** thats a good point, But a decently well insulated 12v would pretty much fix the issue unless the vehicle is siting for extended periods such as days or more without being plugged in, however the majorly increased "usable" capacity of the 12v lithium battery would mean that it wouldn't need to be charged nearly as frequently, and if telsa is leaving the HV system energized anyway then the 12v would be basically being floated so it wouldn't matter if it was cold then. Also even lead acid / Calcium batteries hate the cold, and the cold basically quenches their ability to provide much more than a trickle of power, so if it got really cold you could have issues trying to wake the vehicle up if the HV system and DC-DC Converter wasnt already supplying power. If the battery is insulated enough then very little energy would be needed to warm it enough that it can charge, even if its a slow charge. Once the battery charges it will begin to self heat somewhat. But this is only really an issue if you live in a very cold climate where most owners probably do not.

[@KmanAuto]

-10*F here last week. And this isn't even the coldest part of the USA.

[@a380first2fly]

About Lithium 12V Battery, well remember what has happened with the 787 Dreamliner....

[@KSSilenceAU]

That was Lithium ION or Very Similar, kind of expected. Li-Ion is highly volatile, but LIFEPO4 is not, infact its very hard to get a LIFEPO4 battery to fail catastrophically.

[@Commissar0617]

why TF is there not just a panel in the frunk to access jump points?

[@KmanAuto]

because no power, no opening the hood. original cars, the drunk was a secure compartment. now they changed it, a accessible release lever outside the vehicle allows opening the hood and the jump posts are relocated. really sucks as can’t store anything under the hood now of. value

[@Commissar0617]

is there not a backup key in the fob?

[@KmanAuto]

if the cars 12v is dead, doesn’t matter how good the fob battery is, car won’t operate as it won’t have power to operate the coourers

[@Commissar0617]

physical key. many keyless cars actually have a physical key inside the fob for just such a situation

[@richardtrotman1816]

@@Commissar0617 There is no physical key. In fact, the newer Teslas don't even have a fob. You use the Tesla App on your phone, or a key card similar to hotel key cards.

[@leow_se]

They should made it that the 12V battery being charged when ever it needs to.

[@bovineone]

The 12V battery is normally kept recharged off of the higher-voltage drive battery, but the 12V battery can still fail over time since it is just a deep cycle lead-acid style battery. The separate 12V battery system is a federal/legal requirement for safety and isolation reasons.

[@richardtrotman1816]

It does.. but just like any other vehicle, the 12V eventually stops taking a charge.