12 Volt Demons Caught Up With The Count

[RedRaiderRivian]

Thanks - good to know you got that sorted in time.

Went back through entire vehicle history today - looking for the condensate "drain valve" replacement. Apparently that didn't happen... wet carpet...

T manufacture date is March 13, 2023. First battery replacement (2nd battery) was January 31, 2024 @ 15,846 miles. The vehicle is recorded as being "unresponsive". The ingress towing bill was $1,764.50 (hang onto your wallet, RJ!). No dollar amount shown for the part or labor.

Second battery replacement (3rd battery) was March 17, 2025 @ 39,942 miles - this one "proactive". $160.00 labor (.08 hours), $239.99 for the battery. Customer pay $000.00. There's also a $20.00 "courtesy inspection" on that invoice. Pretty sure I paid $265.00 each for the 2 comprehensive inspections I had done.

I'm well past the 1 year mark on this battery, skating on very thin ice, I guess. The battery tender seems to be doing its job. While I have the trunk tub out to run wiring for a 12v outlet in the bed, I'll add leads for a NoCo charger / maintainer / fixer so I can just plug it into 120. Haven't decided where to leave the plug yet - kind of like the grill option - thinking that's better than the cowl.

This battery history is amazing!! I hope Rivian isn't paying more than a nickel or so for these things.

I ordered the Ohmmu batteries from Electruck4x4. Shipped out in two days and arrive on Thursday. BTW. The warning came back after about a week. I plan to reset one more time before I replace the batteries.

Update: Received the Ohmmu Sodium Ion batteries on Thursday which only weigh 5.5 lbs each. On Saturday I went into the RIDE menu and reset the warning. I then immediately replaced the secondary 12v battery followed by the primary 12v battery following the YouTube video from Ohmmu. The truck powered right up and everything was working. Did a full reset for good measure and so far all sensors, Level 2 charging and everything works perfect. Will test Level 3 in the next day or two.

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[NY_Rob]

I'm well past the 1 year mark on this battery, skating on very thin ice, I guess. The battery tender seems to be doing its job. While I have the trunk tub out to run wiring for a 12v outlet in the bed, I'll add leads for a NoCo charger / maintainer / fixer so I can just plug it into 120. Haven't decided where to leave the plug yet - kind of like the grill option - thinking that's better than the cowl.

I ended up locating the charger in the Frunk and I ran the 120v cord out the grill by the horn..
https://www.rivianforums.com/forum/...bly-solved-or-hacked.31506/page-9#post-604664

 

[NSRoamer]

I ended up locating the charger in the Frunk and I ran the 120v cord out the grill by the horn..
https://www.rivianforums.com/forum/...bly-solved-or-hacked.31506/page-9#post-604664

Thanks, Rob. I did see your post at some point - appreciate the link. I'll probably hook it up like my motorcycles - connect to the battery terminals, then run a NoCo extension cable out to the grill or by the tow hook. I have a few NoCo chargers that sort of hang out near where I park at home. That'll save me from using the power supply to OBD connection unless I'm traveling.

Between this battery issue and the AC condensate wet carpet thing, I'm a bit disappointed with Rivian. Laying off customer service reps and techs at this point doesn't help anything at all - well, maybe financially. A little bit.

 

[TheIglu]

Had mine done yesterday. You'd think pricing would be consistent across all of us Gen 1 owners, but it does not appear so. Original batteries from June 2022 delivery.

 

[RedRaiderRivian]

Update: Received the Ohmmu Sodium Ion batteries on Thursday which only weigh 5.5 lbs each. On Saturday I went into the RIDE menu and reset the warning. I then immediately replaced the secondary 12v battery followed by the primary 12v battery following the YouTube video from Ohmmu. The truck powered right up and everything was working. Did a full reset for good measure and so far all sensors, Level 2 charging and everything works perfect. Will test Level 3 in the next day or two.

Final update: Went to charge this morning at a nearby Ionna Rechargery. The truck started pre-conditioning normally when I left my house and the battery was at optimal temp 8 minutes later when I reached the charger. I plugged in, plug-n-charge worked perfectly and it followed the typical charging curve from 18 to 60 percent. I am happy with the Sodium batteries and the R1T doesn't seem to know the difference. One thing I will say is the voltage on the Ohmmu batteries is around 12.9 v which is almost identical to the lead-acids.

 

[racekarl]

Two weeks after supposedly having both 12V batteries replaced (though only being charged for one) my "replace 12V" warning is back on again.

 

[RedRaiderRivian]

Two weeks after supposedly having both 12V batteries replaced (though only being charged for one) my "replace 12V" warning is back on again.

Thank you for posting.
I am now starting to think there is an issue with the latest software update and how it monitors battery health. I replaced my batteries with the Ohmmu Sodium Ion upgrade and if my warning came back now I would be losing my mind.

 

[Heimat]

Not to interrupt the Count's thread (who's commentary will be missed) but I finally got the dreaded 12 volt battery message. Battery date 2021, so I consider myself lucky to make it this long. I went into the Ride diagnostics and found this. Does anyone know what this means? What I understand is that 13+ volts is still available. Does this mean my 12 volt batteries are failing?

 

[racekarl]

Thank you for posting.
I am now starting to think there is an issue with the latest software update and how it monitors battery health. I replaced my batteries with the Ohmmu Sodium Ion upgrade and if my warning came back now I would be losing my mind.

Got the truck back from its second appointment. I suspect that the initial mobile technician only replaced one of the two batteries, because on the second visit they reported one of the batteries was actually degraded, so not just a software issue. They replaced it at no charge.

 

[sherold]

tech arrived 30 minutes early to God's Country. Tech was great although he had little insight into future snow plow options. It took about 90 minutes to exchange batteries.

Rivian RNG*
parts:$518.00
labor: $209
adjustments: -255.65
subtotal: $471.35
tax: $25.92
fees: $0.00
total invoice amount: $497.27



* Random Number Generator

My factory original batteries are scheduled for mobile replacement tomorrow at a very similar cost.
Parts: $511.30
Labor: $199.50 (.95hrs)
Adjustments: $265.45
Subtotal: $445.35
Tax: $22.42
Total: $467.77

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