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Gen 1 Battery Discharge update for 2024.47.01 and 2024.51.01

fxstein

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Have been keeping a good eye on discharge patterns and did a long test over the holidays to measure the self discharge of the vehicle in Conserve + Shipping Mode.

From 12-4-24 until 1-14-25 the car discharged from about 85% down roughly 50% loosing around 0.79% of charge per day or about 1kWh per day.

Now that I have installed the latest SW updates there is a very interesting observation to be made:

At first look both 47.01 and 51.01 appear to discharge at a lower rate (don't have enough days of sleeping data yet) but the initial charts look like ½ half the discharge when looking at the SoC of the vehicle.

Rivian R1T R1S Gen 1 Battery Discharge update for 2024.47.01 and 2024.51.01 Screenshot 2025-01-25 at 10.58.40 PM


Rivian R1T R1S Gen 1 Battery Discharge update for 2024.47.01 and 2024.51.01 Screenshot 2025-01-25 at 10.58.56 PM


HOWEVER: This seems to be a feel good update to the discharge numbers. While on the surface the SoC decreases at half the rate compared to before (0.3-0.5% per day) don't celebrate too early.

At least part of the newfound efficency comes form the fact that the newer SW is derating the battery capacity gradually while the vehicle is in extended sleep cycles. From late Jan 20 to 22 the SoC discharge looks a lot flatter than before, BUT at the same time the car now derates the battery capacity during the same time by 2kWH from 130kWh to 128kWh. Because the battery capacity decreases, the displayed SoC of the vehicle decreases at a much slower rate.

Rivian R1T R1S Gen 1 Battery Discharge update for 2024.47.01 and 2024.51.01 Screenshot 2025-01-25 at 10.59.11 PM


When driving the vehicle again or when charging it, the battery capacity goes back up about the 130kWh mark, as it used to stay fairly constant before. It Means that that first drive or charge gets 'billed' for part of the discharge that happened while the vehicle was asleep.

I need to do more testing and analysis, but at first look this does not look good. I sure hope this is not a way to improve battery discharge optics.
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cmsjrs

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Do you think that the battery temperature is what is dropping the battery capacity number? We have seen this on the Hummer EV as far as what the vehicle reports through OBD stats. It can be as much as a 10 kWh swing on a ~212 kWh battery.
 
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fxstein

fxstein

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Yeah been thinking about that. Here in NorCal the temps are very moderate. Also did not seem the case before the 47 update.
Unfortunately the API currently does not make battery temp available. Something I will keep an eye on.
 

tate16t

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I knew something changed but could not figure it out. Please keep us posted.
 

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I noticed this this past week. 3 day trip where it sat at airport. Only "lost" 1%. I was surprised. However, my drive home saw me "billed" for the rest of it as I only averaged like 1 mi/kwh
 

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fxstein

fxstein

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View attachment History – Home Assistant - R1T Battery Jan 2025.pdf

Does indeed seem that the discharge SoC % gets eased by derating the battery capacity temporarily since 47.01.

I put the main variables next to each other. You can tell that the estimated vehicle range, while more noisy, decreases at the same delta as before - since it cancels the shift from SoC to Capacity derating out.
 
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fxstein

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Tonight I am going to charge to 100% since I have not done that in a while and we are doing a little road trip to Big Sur for the day tomorrow.
 
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fxstein

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And whie I was at it here is the most current 1 day period with the charging just started as well as the two days with 47.01 and 51.01 next to each other. The spikiness does not seem to have anything todo with either version but seems to happen once the SoC of the vehicle crosses somewhere below 65%. Above that the spike are gone and you only see that during the active maintenance cycle in between the sleep periods, the batery capacity now gradually drops.
 

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zefram47

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Nice to see a graph of this. I use ElectraFi and look at it multiple times per day a lot of the time. I'd noticed the battery capacity number fluctuating in a way it hadn't before, but didn't attempt to aggregate the data. Very odd they would've changed this behavior.
 

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fxstein

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Could just be that they implemented it to reflect more real Live capacity estimates. But it is certainly different from before 2025.47.01
 

MidnightM00N

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Noticed the same change with .47 and beyond. Definitely battery temp related as I notice a pretty big difference here in OH with the car sitting outside in -5 to 15 degree weather vs in our garage at about 50 degrees. Gen 2 DM Max with capacity as high as 139-140kwh and as low as 134-135kwh per Electrafi. Was always 141 prior to the .47 update.

Curious if this will continue over updates, if more transparency will be released, and if it impacts accuracy of range estimates in various temps (for the better?)
 

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I plugged in last night and it topped off at about 11:30pm, charging stopped just before the Feb 2 mark. After Feb 2 you can see an increase in SOC, all without charging.

Rivian R1T R1S Gen 1 Battery Discharge update for 2024.47.01 and 2024.51.01 IMG_0033
 
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fxstein

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Yes that if definitely the new behavior. Just doing a 4 day test (had to jump on an international trip) and the first 48h of standing time now is basically feel-good numbers.
During that time (and possibly longer) the SoC numbers by themselves are no longer an indicator for the amount of energy stored and phantom drain is hidden.
The moment you park the Rivian, the new .51 firmware starts derating the battery capacity, by about 1-2kWh per day. By doing so the SoC numbers stay flat or are even increasing before they level off. This used to be a straight linear line of continuous SoC discharge. Now it starts flat (or even slightly increasing) before it levels off and bends into the real discharge curve.
 
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fxstein

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Pulled the latest data. Parked the truck on Jan 31st with exactly 69% SoC. Went as high as 69.7% within the following 24h before leveling off and starting to decline. At the same time you can see how the battery capacity rating dropped by 2kWh or more in the first 24h of parking.
With .51 Rivian no longer show any phantom drain in the first 24-48h. I assume that’s the time most users stay within duration by normal usage pattern. Driving the vehicle daily and maybe parking a day.

Rivian R1T R1S Gen 1 Battery Discharge update for 2024.47.01 and 2024.51.01 IMG_0457
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