HVB battery capacity - is there any way to determine its current capacity?

[Singletracker]

And, NO. I’m not interested in having another third party app track me and my vehicle, nor do I intend to pay for one. I do my own data collection. I would just like to know the CURRENT useable capacity of my HVB. This would be necessary for computing potential range data. Is there any way to access that data directly from the vehicle? I believe Rivian says, when new, the large battery pack on my ‘23 R1T QM had 131 kWh of useable battery. Currently, after about 25K miles, for calculation purposes, I have arbitrarily downgraded my useable HVB capacity to 129 kWh. Don’t know how accurate that figure is.

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[ndmiller]

There is really no good way to determine this information unless you know the actual real capacity off the total battery along with how much is locked away to calculate your usable. Or 2 out of the three data points.

There is one school of thought that as the battery degrades, the degradation occurs on the locked portion making that portion smaller while usable battery capacity remains constant. BUT the competing thought is the opposite that the locked portion retains it's capacity while usable goes down.

I don't think Rivian has released enough detailed information to determine how they handle BMS or the total capacity (in addition to usable) of the battery.

I could be wrong about the above or just not in the cool kids "know", so maybe someone else has Rivian specs to share.

 

[beatle]

You could use the Home Assistant integration for Rivian.

The battery capacity is a sensor.

 

[Dark-Fx]

Run the battery down and look at how much energy it used for each percentage.

 

[Singletracker]

Ya know, I can go onto my iPhone and see what the current battery (%) capacity is. I can do that on my iPad, Apple Watch, and laptop - easy, peasy. Without jumping through a bunch of hoops, why can’t I do that on my Rivian? OR, can I?

 

[Oldsmobile_Mike]

Lot of good info in this thread:

https://www.rivianforums.com/forum/threads/rivian-wont-tell-me-battery-soh.33338/

I just checked mine on ElectriFi using the instructions found in that thread. Works fine. Maybe sign up for the free trial? Probably the easiest solution.

 

[MountainBikeDude]

Ya know, I can go onto my iPhone and see what the current battery (%) capacity is. I can do that on my iPad, Apple Watch, and laptop - easy, peasy. Without jumping through a bunch of hoops, why can’t I do that on my Rivian? OR, can I?

No. Is that the answer you were looking for?

Rivian used to have battery SOH in the RiDE menu, but anyone that had access that was in the lamen category, started going off about why their SOH was only 98% or 96%, so Rivian pulled that metric from the menus.

You can look at the batteries useable capacity inclusive of reserve, for free, via ABRP and linking it to your Rivian account. That and other free options like RivianRoamer are the only ways to see the total. Keep in mind it will fluctuate up or down around 2-3 kWh depending on several factors like BMS calibration /sway, battery temperature, etc.

It may be an accessible metric via a Rivian in the future when they bring out the user service menu for owners to deal with things like 12v battery swaps etc on their own, but that's just an assumption on my part.

 

[Rivian Roamer]

No. Is that the answer you were looking for?

Rivian used to have battery SOH in the RiDE menu, but anyone that had access that was in the lamen category, started going off about why their SOH was only 98% or 96%, so Rivian pulled that metric from the menus.

You can look at the batteries useable capacity inclusive of reserve, for free, via ABRP and linking it to your Rivian account. That and other free options like RivianRoamer are the only ways to see the total. Keep in mind it will fluctuate up or down around 2-3 kWh depending on several factors like BMS calibration /sway, battery temperature, etc.

It may be an accessible metric via a Rivian in the future when they bring out the user service menu for owners to deal with things like 12v battery swaps etc on their own, but that's just an assumption on my part.

it’ll sway as much as 10 kWh. My Tri Max when from 143 to 133. Wild.

 

[Singletracker]

No. Is that the answer you were looking for?

That’s funny But, No. While that may well be THE answer, it’s not the one I was hoping for. Oh, well.

 

[Singletracker]

Okay. Here’s another question that nobody will have an answer to. If the available HVB battery can vary so much depending on conditions, why did Rivian claim the battery had 131 kWh useable. Seems like that could be very misleading. I don’t recall it saying 131 kWh under certain conditions. Now, i can’t seem to find where Rivian had posted that. Maybe they took it down.

 

[Rivian Roamer]

Okay. Here’s another question that nobody will have an answer to. If the available HVB battery can vary so much depending on conditions, why did Rivian claim the battery had 131 kWh useable. Seems like that could be very misleading. I don’t recall it saying 131 kWh under certain conditions. Now, i can’t seem to find where Rivian had posted that. Maybe they took it down.

The reported capacity via the API isn't true capacity. Rivian reserves some of the battery for cold weather operations and they do this by reducing this capacity number. The physical capacity of the battery is not accessible anywhere.

 

[MountainBikeDude]

Okay. Here’s another question that nobody will have an answer to. If the available HVB battery can vary so much depending on conditions, why did Rivian claim the battery had 131 kWh useable. Seems like that could be very misleading. I don’t recall it saying 131 kWh under certain conditions. Now, i can’t seem to find where Rivian had posted that. Maybe they took it down.

https://rivian.com/en-CA/support/article/what-is-the-usable-kwh-capacity-of-your-battery-packs

 

[Rivian Roamer]

Yeah the gross capacity is being met.

The net capacity (as reported by Rivian) changes as they set aside some reserve. I wish they would share the gross as well.

 

[Singletracker]

https://rivian.com/en-CA/support/article/what-is-the-usable-kwh-capacity-of-your-battery-packs

Thank you. That is exactly what I was looking for. Now, you are batting .500 - Hall of Fame material

I’ve seen gross battery capacity listed at 135 kWh.

 

[mkhuffman]

it’ll sway as much as 10 kWh. My Tri Max when from 143 to 133. Wild.

I was able to check the Energy to Empty (EtE) at 100% using a OBDII scanner on my Mach-e. This is only relevant because I observed a loss of 5 kWh or more in the winter. Battery capacity does decrease when the battery is cold, and could explain what you saw.

The BMS calculates the SoH, so I wish we could see it via the API. I understand why Rivian hides it, because it has caused some stress in the Mach-e owner community. When I traded in my Mach-e, the SoH was reported by the BMS as 89%. I was able to confirm that by checking the EtE at 100%. It certainly didn't make me happy.

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