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Ohmmu 12V Battery Feedback
- Thread starter LasVegas2019
- Start date
Stellavator
Member
Avoid. I putchased a battery for my model 3 and it absolutely did not work. Kept getting all sort of errors. Maybe they fixed this by now. But my beef with them is when I contacted them for help, they totally ghosted me. Not only no refund, but absolutely no communication. Avoid this company.
According to the app store the IOS app is version 2.0. According to the app, the BMS firmware is version Tesla Model 3. To update the battery firmware is simple. Open the app and connected to the battery as normal. Go to the Advanced page (bottom right of app). Go to bottom. A new section is there called BMS Firmware. Select "Update" and there will be a whole menu of what type of car you are doing the update. In my case I selected model 3. Leave the phone within bluetooth range of the battery. The update will take only a couple of minutes. A complete banner will appear. That's it! If a error occurs like draining or replace battery go to app while in bluetooth range and select "Send Config" Again takes a couple minutes. I would followup with Ohmmu with the issue and mention data file sent in.
Don't waste your time or money on an OHMMU Li Battery! They are CRAP, and worse yet there is no phone contact for the company, so that shows their lack of care for their customers. Purchased one for my 2018 Model X, and within one day I got the Low Voltage Battery WARNING. I attempted the reset that OHMMU website recommended (pulling all USB's, and resetting your wheel designation), but no luck with that. Had to pull the whole frunk apart AGAIN to hard reset the car (pulling high voltage plug, and disconnecting the negative contact of the 12 volt battery for five minutes). That worked for a day, then the warning is back! Looking at all the various blogs this is a SIGNIFICANT problem with OHMMU, so dont wast your $$$ on this overpriced POS! Not to mention wasting your time because its not like you are just changing a battery, its a whole process pulling the frunk apart each time!
I am losing confidence in omhmu. They continue to not respond to emails except intermittently and unpredictably, and although they say that a version 2.0 with firmware flashing will be available on Android it has never appeared now a month later after they said it would. I think unfortunately they don't know how to solve this problem and they've come up with a series of Band-Aids hoping that this will keep them from a complete crash of their business model. Unfortunately it looks like they are abandoning any real efforts to have a battery that can work on Model 3/Y
People report 2-4 years. I have a 5 and 6 year old battery that are fine.
Tesla will cover under original 4 year warranty.
Most people get a warning on the screen, and the car will switch to a mode where it will run forever in that mode, but it uses a lot more electricity.
There's a 29 page thread on this here:
"Proactive" 12v battery replacement - good idea or overkill?
The only "major" service issue I have ever had with my 2018 P3D is that I had to have the 12v battery replaced after about 2 1/2 years. Even though it was covered under warranty, I consider it a major issue because it rendered the car undriveable and it had to be towed. At that time, there was...
teslamotorsclub.com
daniloreyes
Member
Well and the fact that models 3 no longer have regular batteries, their batteries are not going to be sold.
Spoke too soon. Just got the app version 2.0 yesterday from Queenie at omhmu. Works well, with a significantly more stable connection to the battery, was able to update firmware in the battery. With the warm temperatures however I have not had a concern and have not had to do resets. We will see this fall if in fact the firmware takes care of the problems in cold weather better.
Also, have you installed the battery with the new firmware? I had noted (I am on 2023.7.20) that after the 6 hour initialization the battery would go through a oscillating charge/discharge sequence with greater and greater discharges at higher amp draw each cycle. The final discharge was at 25 amps and I stopped it at 49% state of charge. Wondering if later Tesla software versions behave differently.
Ohmmu sent me a bluetooth battery replacement and since installing it about 8 months ago I have had no issues. No more "replace battery soon" warnings.
Stanwood Steve
2018 Performance Model 3
How did you get in touch with them? I can't find a phone number for them, and they aren't responding to my emails.
Googling "Ohmmu phone number" brings up a phone number.
It's also posted in the very thread you are in: Ohmmu 12V Battery Feedback
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