Tesla Model 3 12V Battery Replacement in 10 MINUTES How To DIY 

Just a couple of things: 1. It's 12v, you're not going to shock yourself touching it. It is better to touch the connectors when putting them back on the battery and wiggle they down all the way on the battery connectors to ensure maximum contact and a snug fit instead of avoiding touching the metal. The prongs are slightly tapered. 2. You don't need to cover the negative with a rag. The chassis of the car is connected to it after all so whenever you touch the bodywork, you're touching the negative haha. Thats also why they don't bother covering the negative terminal with a plastic cover, but the positive is covered. 3. The order of operations here are wrong, while im sure realistically no damage will occur, it is still best to follow the instructions to potentially avoid a bill if you break the DC-DC converter. The correct order: 1. Lower the rear right window 2. Lower the driver's window 3. Open the driver and rear right door and leave them open until finished 4. Pull up the seat 5. Go to the screen and open up the frunk 6. On the screen now power off the vehicle 7. Go to the frunk and disconnect the battery negative connector 8. Go to the rear and disconnect the DC-DC converter cable 9. Go to the front and disconnect the battery positive connector and remove the battery/vent hose 10. Place in the new battery and attach the vent hose 11. Connect the battery Positive and tighten 12. Go to the rear and connect the DC-DC plug back in 13. Go to the front and connect the battery negative and tighten 14. Secure the battery with the mounting hardware 15. Put the rear seat back together Finished

Great tutorial, very specific and detailed... 🙂

Not touching the metal, while holding a ratchet that is touching the metal gave me a chuckle. Good video, this is in my future!

Noooooo! Don’t pull the latch out first! I’m a technician for Tesla and you don’t want to pull the latch first. You disconnect the battery so that there is no battery voltage going to any controllers and then you disconnect the logic connector. Think of the battery as a negative and the logic connector is a positive.

One thing I always do with a new battery is put it on a battery tender overnight to make sure it really is charged fully before installing.

And to reenergize the vehicle, press the brake pedal

The seat latches go SIDEWAYS. I kept pulling up on them, pushing down, trying everything. I didn't realize they needed to be pushed towards the left side of the car, and the rear seat releases so easily!

Tesla OEM 12V battery is not good, Costco Interstate 12V battery group 51R is better, cheaper, and drop right in. when you call costco they will tell you they don't have Tesla battery because they didn't have Tesla on their list, but trust me this one fit like a glove

Just a little tip, it's better to disconnect the 12v negative cable first before removing the plug under the rear seat. When the 12v is the only thing powering the car, it can drain and then not close the HV contractors

Eduardo - I cannot find the high voltage latch under my back seat in my 2018 Model S. I don't see the gray plug with the lever - only a black & red plug. Don't know what that is but anyway - how can I reset the battery warning now that I've changed the battery?

Ridiculous. All that technology and the 12V batterry is lead acid.

I'd just let the Tesla Mobile guy do it for $30. He's done it 100 times.

maybe it takes 10 minutes if you practice it several times. But it will not take you 10 the first time you do you. Author doesn't show there is a little clip on the high voltage cable you must squeeze to rotate the lever down. And I had to use a screw driver to pry it up. The little air vent fitting easily falls down into the car labyrinth below and then you need time to fish it out. Some pump would NEVER TURN OFF, even after powering the car down, until I boldly went ahead and disconnected the ground terminal as a final step and it finally stopped. It all seems to work ok now but like a typical car project you do once, budget 30 minutes I'd say.

Great short video with everything explained well. It took me ~15 minutes to do the same on my Model 3. Thanks a lot!

I picked up a new '24 Model Y a few weeks ago and was checking the service mode. Noticed that new Model Y's have a 16v lithium low voltage battery which is much smaller and lighter. Not sure about the replacement cost of these new batteries when they fail.

Just requested this service on the tesla app. The estimate is $120 for them to come to my office and change the battery for me. Seems like a no brainer to have them do it

😮‍💨😮‍💨😮‍💨😮‍💨😮‍💨 first pop open your frunk, i did this step by step and when i got to the frunk part I couldn’t open it now

Do you void your Tesla warranty if you DIY the 12V battery ?

Almost as complicated as some Germany cars 👎

Well done! Great video.

Can you provide link or store where you bought it from?

Something I did not know until about a year ago, when replacing 12v batteries in vehicles, get the little kit with red and black felt washers and some terminal protectant spray and use those. Can prevent the terminals getting all funky and fuzzy.

That battery was gettin' swol. 😂

After my 2020 Model X experienced a complete dead, I replaced the 12V battery with an Ohmmu battery. However, three days later, I received a scheduled service message to replace the low-voltage (LV) battery, followed by a notification to pull over safely. Upon inspection, the Tesla technician determined that the aftermarket lithium battery was causing the LV circuit to repeatedly overcharge. This overcharging led to the degradation of the LV battery, necessitating its replacement with a proper lead-acid original equipment battery. As a result, I paid $640 for the original battery and labor, and returned the Ohmmu battery, incurring a $38 fee for the return label and a $90 restocking fee. Despite these issues, I noticed that Ohmmu still offers batteries for the Model X, which I find perplexing given the circumstances.

Best price I could get in California for a Atlas BX/Hankook 85B24LS 12V 45Ah battery was $340.

Hello everyone, I just requested a battery change service in Tesla and to go and change it at home it is $121 for everything already with Texes , i live in California !! Good luck 🍀

$86 WHAT, I paid north of $375 eBay 🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️

I bought a "recommended" replacement battery because the Tesla dealer is about 100 miles away. My new battery does not have the vent tube shown on the video. Do I really need the vent hose? BTW, The old battery is 5 years old and working fine but other people say it should be replaced after 3 years.

negative on the 12V should be disconnected prior disconnecting the High Voltage not the opposite. Also service mode could be used and most important, wait that the heating is completely off, then power off using the screen then 12V off, High Voltage off. Replace the battery, then high voltage reconnect and last 12V reconnect. If it is a model 3 with heat pump the procedure is different. Always consult the official service manual

Well done….you did great. Where did you get the batteries? At the Tesla hub?

you don't even feel the 12v volt, especially when you're off from the high voltage battery pack

How long until you needed to replace the 12v battery?

Thank you. You have saved me some bucks hurray

How did you find out that you need to replace your 12V battery?

Didn’t work for me. Put new battery in and it still says need new one.

thanks! worked perfectly

How do you turn off the system on the screen, and roll down the windows if the battery is dead?

Where did you buy the battery?

Thank you! It was easy with your instruction and it worked!!!!

Very helpful, thanks 🎉

Was it helpful? It was perfect. You are a great teacher/presenter. No extra nonsense, all usable instruction. Well done.

Is this covered under battery warranty

whats the 12v battery model number ?

Energy vampire

How much did you pay for the battery

What indicators if any tell you that the 12V needs to be replaced?

Thanks for the helpful comments.

Where did you purchase the battery at? I need to replace mine as well.

Your video was put up 5 months ago, making it around mid 2023. It's now January 2024. Where did you get the battery for only +/- $85.? The Tesla Center near me lists the battery for $225.! ... (and it's back ordered) :(

Thanks

thanks!

PSA: To anyone who wants to DIY anything, dont take advice from someone who is doing something for the first time. Especially if they can't be bothered following manufacturer specs or learning part names

GREAT VIDEO AND DETAIL INSTRUCTIONS

Thank you so much! Your instruction was perfect. I doubted 10 minutes, but I finished mine in maybe 5 minutes. There is always some challenges to DYI, but this one was a cake walk.