12V Battery Replacement Megathread

[HaveBlue]

Rivian vampire drains 1% of the HV battery per day (30% per month) trying to keep that little 18ah battery charged. It's a travesty. They've managed to lie to us by tweaking the firmware to show zero loss over night but leave it for days and you will see it quickly nose dive.

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[usulio]

Rivian vampire drains 1% of the HV battery per day (30% per month) trying to keep that little 18ah battery charged. It's a travesty. They've managed to lie to us by tweaking the firmware to show zero loss over night but leave it for days and you will see it quickly nose dive.

Also, a design that keeps waking up the vehicle and draining the little 18ah battery to upload data about you for Rivian's benefit, you pay the electricity bill.

 

[kallisti5]

Looking at the graphs here, it looks like Rivian tries to use as much of the 18Ah battery as possible before powering up the DC/DC converter to power the computers and charge the battery.

My guess is they're trying to reduce consumption on the main drive battery until the next time you plug in where they can charge the HV and low voltage batteries.

Fun follow up.. confirming that the 12v replacement button in RiDE doesn't actually do anything. I'm guessing I need to call Rivian service at minimum to clear the codes

 

[ksujeff99]

Looking at the graphs here, it looks like Rivian tries to use as much of the 18Ah battery as possible before powering up the DC/DC converter to power the computers and charge the battery.

My guess is they're trying to reduce consumption on the main drive battery until the next time you plug in where they can charge the HV and low voltage batteries.

Fun follow up.. confirming that the 12v replacement button in RiDE doesn't actually do anything. I'm guessing I need to call Rivian service at minimum to clear the codes

Have you successfully cleared the 12V warning message yet, without Rivian’s help? I have the Ohmmu batteries in my 2022 R1T, which worked great until the last software update changed the 12V diagnostics. I’ve had the 12V warning message ever since. Ohmmu even replaced both batteries under warranty. I was successful in getting the 12V error message to go away once, but it quickly came back a day or two later. No amount of disconnecting the HV & LV, RIDE menu 12V resets, or hard resets has worked.

If I knew it would solve the issue, I’d gladly give up some space in the frunk to mount a full size deep cycle battery

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