Rivian Roamer Plus and 12V Battery Health

[Aardvark]

I'm one week into a new subscription with Rivian Roamer Plus, primarily to monitor the status of my 12V battery. I'm on the original (single) battery in a Sep 2023 Gen 1 R1S with 42,000 miles.
My question for other RR subscribers is this. Will RR flag a failing 12V battery before the car triggers the dreaded red warning light? Does anyone have experience with catching an early 12V issue?
If I'm not using the car for a few days, I hook up a battery tender. I'm keeping that disconnected for a few weeks thinking that it may provide false battery health data to RR.
While my primary interest is in the battery health, let me also say that I'm quite impressed with all the other data provided by Rivian Roamer. It puts a smile on the face of this geek, former engineer.

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[Rivian Roamer]

I'm one week into a new subscription with Rivian Roamer Plus, primarily to monitor the status of my 12V battery. I'm on the original (single) battery in a Sep 2023 Gen 1 R1S with 42,000 miles.
My question for other RR subscribers is this. Will RR flag a failing 12V battery before the car triggers dreaded red warning light? Does anyone have experience with catching an early 12V issue?
If I'm not using the car for a few days, I hook up a battery tender. I'm keeping that disconnected for a few weeks thinking that it may provide false battery health data to RR.
While my primary interest is in the battery health, let me also say that I'm quite impressed with all the other data provided by Rivian Roamer. It puts a smile on the face of this geek, former engineer.

Hey there, thanks for trusting me and subscribing!

Right now it only surfaces when Rivian reports an error. However, I am gathering data to look for signals that your 12V may be in trouble. The cost of being wrong here is high. My tactic has been to surface data – not decisions. If I'm wrong, that burns customer trust.

With that said, there does seem to be a correlation between the amount of time your vhiecl his awake and 12V, but not always and this is the crux.

I'm not entirely sure if connecting a battery tender is recommended at all. The vehicle uses DC to DC to keep the 12V topped up.

I'm very glad to hear you're enjoying it so far!

 

[UnsungZero_OldTimeAdMan]

I've seen multiple shares of people hooking up their 12V to tenders, some even through OBD2 port adapters, and report no vampire drain. That suggest it makes a difference in maintaining battery health... as trickle charging tends to do on any automotive or marine batteries.

I shared in my thread regarding recent preemptive replacement notification from Rivian... that an insider shared Rivian is aware of an early batch of PCBs that were made out-of-spec. And a certain screw could come in contact with other objects and create a short or sudden voltage spike. Rivian isn't sure which batch precisely, so they wrote software (already implemented in one of the OTAs) to monitor wiring harness voltage. In some cases, the offending PCB had to be replaced. While this may not be the one cause for all failures, it is one that they are aware of and is proactively monitoring.

I'm not yet a RR subscriber. While still employed, the situation can turn on a dime and it's been that way for over three years with no improvement in sight. I've been reducing the number of my subscriptions not adding. Definitely among short list of subscriptions to add when in better times.

 

[Aardvark]

I've seen multiple shares of people hooking up their 12V to tenders, some even through OBD2 port adapters, and report no vampire drain. That suggest it makes a difference in maintaining battery health... as trickle charging tends to do on any automotive or marine batteries.

I'm not yet a subscriber. While still employed, the situation can turn on a dime and it's been that way for over three years with no improvement in sight. I've been reducing the number of my subscriptions not adding. Definitely among short list of subscriptions to add when in better times.

I am connecting through the OBDII port (2 amp trickle/desulfater) In a separate post from a few months ago I reported the significant reduction in vampire drain after the car was unused over 8 days. At least for me, this system works.

 

[UnsungZero_OldTimeAdMan]

I am connecting through the OBDII port (2 amp trickle/desulfater) In a separate post from a few months ago I reported the significant reduction in vampire drain after the car was unused over 8 days. At least for me, this system works.

And definitely worth considering for anyone else wanting to be proactive about a potential issue. But as you pointed out, it could also mask an underlying problem.

 

[Aardvark]

Hey there, thanks for trusting me and subscribing!

Right now it only surfaces when Rivian reports an error. However, I am gathering data to look for signals that your 12V may be in trouble. The cost of being wrong here is high. My tactic has been to surface data – not decisions. If I'm wrong, that burns customer trust.

With that said, there does seem to be a correlation between the amount of time your vhiecl his awake and 12V, but not always and this is the crux.

I'm not entirely sure if connecting a battery tender is recommended at all. The vehicle uses DC to DC to keep the 12V topped up.

I'm very glad to hear you're enjoying it so far!

Thanks for the reply! I understand the issues with predictive analysis. Your concerns make sense.

 

[Ritzvian]

Hey there, thanks for trusting me and subscribing!

Right now it only surfaces when Rivian reports an error. However, I am gathering data to look for signals that your 12V may be in trouble. The cost of being wrong here is high. My tactic has been to surface data – not decisions. If I'm wrong, that burns customer trust.

With that said, there does seem to be a correlation between the amount of time your vhiecl his awake and 12V, but not always and this is the crux.

I'm not entirely sure if connecting a battery tender is recommended at all. The vehicle uses DC to DC to keep the 12V topped up.

I'm very glad to hear you're enjoying it so far!

@Rivian Roamer great to hear you’re looking into this and I appreciate your concern for customer trust. What technology are you using to analyze historic data for these battery degradation patterns?

 

[impulsoren]

there does seem to be a correlation between the amount of time your vhiecl his awake and 12V, but not always and this is the crux

How often does the vehicle report 12v voltage? Is there a way to graph low voltage system voltage alongside sleep/wake cycling?

 

[Rivian Roamer]

@Rivian Roamer great to hear you’re looking into this and I appreciate your concern for customer trust. What technology are you using to analyze historic data for these battery degradation patterns?

I'm just trying to identify reliable and robust signals. So far I haven't found anything with > 80% accuracy. Until it reaches near 100% I won't implement it. I'd rather give data without any judgement.

 

[Rivian Roamer]

How often does the vehicle report 12v voltage? Is there a way to graph low voltage system voltage alongside sleep/wake cycling?

Voltage is not reported.

 

[Ritzvian]

I'm just trying to identify reliable and robust signals. So far I haven't found anything with > 80% accuracy. Until it reaches near 100% I won't implement it. I'd rather give data without any judgement.

Oh ok, got it. So are you just looking through spreadsheets full of this data or do you have some other way to review it at scale?

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