Ohmmu Announces BT19 Sodium 12V Batteries for Rivians: Thoughts?

[Time2Roll]

I’ve had the Li battery and now their sodium version. Ohmmu didn’t fail with the Li battery, A Rivian software update changed the charging parameters to try and fix their problems with the Lead batteries and it cause a nuisance fault with the Li. It never stopped working, it was just an annoyance to look at. They sent me a sodium replacement for free and I’ve had zero issue with it. I’d absolutely recommend them.

Short dive into Na charge voltage indicates higher voltage compared to Li. I assume top charge voltage was increased to 14.6 - 14.8+ range with the LA battery and could give Li some issues. Na goes to 15.6 - 16.0 range. Even if short charged a bit does not cause capacity loss like the LA.

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How are the sodium ion batteries holding up so far?

Great! No errors, no issues. Works just like OEM batteries.

Then again, it's only been 6 weeks since I installed them.

 

[Kunzene]

Got the 12v replacement alert tonight. Ohmmu ordered… fingers crossed they get here before mine fail

 

[100jacks]

My 2 x Ohmmu 12V sodium batteries arrived yesterday, and I was able to install them today.

I followed their video instructions, and it went off without a hitch. After replacing the batteries and a hard reset of my 2022 R1T, all my errors cleared, and I was able to drive it around all day with no issue.

For the curious, here are some photos of my Ohmmu batteries before I installed them in my vehicle:

I wish a took a photo of it before dropping them in, but I had a 12V battery tester that I tested the Ohmmu batteries with, and they were able to crank out 500+ Amps as advertised (not that that's needed, being Rivian seems to only pull about 30 Amps from the 12V batteries).

For those curious, here are some photos of my old Rivian OEM 12V batteries that the Ohmmus replaced:

I ran my battery tester on both my old OEM Rivian 12V batteries. Here were the results:

Conclusions:

• The installation went pretty smoothly. It took me just over 1.5 hours, and that includes grabbing tools and watching/pausing the video instructions along my install. I was going pretty slow to make sure I wasn't shorting anything.
• The hardest part was getting a good grip and pulling out the old OEM batteries from that cramped space.
• You will also need to sit on the front lip of the frunk with your legs in the frunk to more easily unbolt and remove/replace the batteries. Try not to bang your head against the frunk cover's metal latch 10 times....
• If I'm reading my battery tester correctly, my old OEM Rivian 12V batteries seem to be in good health, despite them being 3.5 years old. I'd expect another year or 2 of life out of them. This is surprising to me since I've certainly been taxing them quite a bit by leaving Gear Guard persistently on (even when parked outside at home) and hence theoretically having higher cycling of the batteries, and they are subjected to some hot summers here in Alabama. Guess I lucked out compared to some other Rivian owners with bad OEM batteries.

Thanks for a.detailed.review. did have to buy adapters for battery terminals separately or they came with the battery?

 

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Thanks for a.detailed.review. did have to buy adapters for battery terminals separately or they came with the battery?

The adapters came with the Ohmmu batteries already installed. It's a drop-in replacement.

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