You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I installed an Ohmmu Li Ion 12v in March. Did it myself because I like that stuff. Ohmmu is made outside of Phoenix. Comes with 4 year 100% warranty. Not prorated. Some users report over 5 years of service. Live in Tucson where 12v wet cells are dead in two years. Ohmmu is an outstanding company too deal with.Had a 12 volt battery failure the other day. Had my M3 for less than 2 years. Fortunately I was at home and I needed to pull vehicle back in the garage. Got into the car and closed the door. No power at all. Had to use the door lever to open door. Contacted Tesla and they could not communicate with vehicle. They setup a tow to the service center. Battery was replaced quickly but did not think about the driver window after using lever. Drove the car home and did not immediately realize the window was down about 1/2 inch. The window would bounce down when rolled up. Setup a mobile service appointment. The window just needed a recalibration. Tesla does warn about using the lever and this is what could happen. Wanted to share this for others.
There's not one thing that points to a bad 12v battery. Some last less than 2 years, a few go for 7. If you smell eggs, that's one sign. If its bulge, that's another sign however hard to view under all the plastic. corrosion is a sign of a bad battery but again, hard to see under all the plastic.What statistics should one look for to determine if 12V is close to done? I saw a video showing that Internal Resistance was the key statistic vs just voltage. Mine is 3+ years
Our 3's battery died quickly after 18 months. Given the number of replacements I've seen here it would be good to replace it before a long trip. You could also just purchase the replacement and carry it with you until needed I suppose.
We had Tesla replace the 3's 12V because of the car's weird behavior. That was performed under warranty, so no cost to us other than Service Center run around. Not an option if the car hasn't warned you yet.
We had our X's 12V battery replaced with an ohmmu after getting a warning from the car. Turns out they are local for us, so we had them install it. So far so good, but it's only been four months. As our road trip car, I felt safer with the ohmmu than a direct replacement. I haven't heard of anyone having an ohmmu long enough to reach end of life yet. ohmmu said the 3 was an easy replacement. The X has more screws to take out and a bit more complexity to the process.
Why does this require a service appointment as opposed to getting a battery at the auto parts store. Am I missing something?
Not sure what the warranty is on the 12v battery, but I would think being under 3 years it would be covered.Why does this require a service appointment as opposed to getting a battery at the auto parts store. Am I missing something?
I only have 5,427 miles on my 2018 Tesla M3, LW, AWD purchased new in Oct 2018. I have a few questions about the 12 volt battery. I still am using the original.
I recall there are a couple of wires below the right side of the left headlight (driver's side) under that round cap. I know those are to activate the doors and such if the 12 V batteries dies. I think I heard somewhere that all it takes is a little 9 volt battery to activate so the doors can be opened--and I assume drive with a dead 12 volt battery as then the DC2DC converter will supply the voltage from then on, while driving. I am surprised to hear the DC2DC converter is not activated also while charging.
Is it really possible to use a small 9V battery there? If so, I guess I should keep one in my pocket!
Another question is it worth it to install the Lithium 12 volt battery for $479.00?
And does the warning usually come on before the battery dies? I had no idea there was such a warning until I read this thread.
So when I am I mostly likely to need to replace this battery?
-Don- Reno, NV
Mine is also a Oct 2018 build. I carry a 9volt battery in all my coats. I don't think it opens the doors, but opens the frunk, so you can access the 12V. When will you need a new battery? Of course when you least expect it.I only have 5,427 miles on my 2018 Tesla M3, LW, AWD purchased new in Oct 2018. I have a few questions about the 12 volt battery. I still am using the original.
I recall there are a couple of wires below the right side of the left headlight (driver's side) under that round cap. I know those are to activate the doors and such if the 12 V batteries dies. I think I heard somewhere that all it takes is a little 9 volt battery to activate so the doors can be opened--and I assume drive with a dead 12 volt battery as then the DC2DC converter will supply the voltage from then on, while driving. I am surprised to hear the DC2DC converter is not activated also while charging.
Is it really possible to use a small 9V battery there? If so, I guess I should keep one in my pocket!
Another question is it worth it to install the Lithium 12 volt battery for $479.00?
And does the warning usually come on before the battery dies? I had no idea there was such a warning until I read this thread.
So when I am I mostly likely to need to replace this battery?
-Don- Reno, NV
Is it true I can just buy a "spare" or replacement 12v battery from a tesla service center? I looked at the battery swapping procedure and can do that no problem. Our closest service center is 120 miles from here but we are occasionally near there and would like to just get one as a spare, especially if the replacement from Tesla is less than the $120 for the 51R from Walmart.