Max Charge Limit Question

[BTOR]

In the past couple of weeks, my max charge limit has dropped from 410 miles to 401 miles at 100% SOC in my 2025 R1S with only 4300 miles. I can’t imagine the batteries have degraded in this short period. The vehicle is only 7 months old. I am the second owner. I took ownership in mid November. I have only logged 500 miles in it since then. I have only charged 4 times, each time when SOC hits ~ 20% then charge to 70% SOC. I don’t know the original owners charging habit since I got it through a dealer. However, I do know l he was a multiple EV owner so I assume he had good charging habits. I know in time the max range value will drop. I just didn’t expect it this soon if that is truly what I am experiencing

Trying to figure out an explanation, if there is one. And, can I expect it to bounce back.

A few things to note. It has been colder the past few weeks with temps ranging from the mid 20’s to low 40’s. Could this be an explanation and when the battery finally gets a chance to warm-up, the max SOC mileage will bounce back up. The battery temp has been sitting around 40° to 45° F and stays there even when driving it.

My vampire drain is very consistent @ 1% every 36-48 hrs. This has not changed since I took ownership. This seems very reasonable since it is charging the low voltage battery.

I have not done a full charge to 100%. I plan to do that this coming weekend prior to departing on a long journey. But when I slide the charge limit to 100% it now says 401 miles. And, as I’ve been planning my trip these past few weeks, it’s declined from 410-401 miles. A couple of weeks ago when I started planning, it said 410 miles.

I have not tried a soft reset but the car was at the SC last week and I am sure they did at least one, but maybe not. Maybe that is worth trying.

Anyone out there have any explanation, thoughts and/or other recommendations?

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[eskudo12791]

newer firmware tracks real world weather and temps to calculate max range

 

[mpshizzle]

The estimated range is really hard to rely on. It depends on so many factors and is rarely accurate. Fluctuations and temperature battery health recent driving etc etc

A general rule of thumb is the batteries will degrade most within the first year or two of their life. It's common that within the first couple of years a battery will lose between 5 and 10% on the high end of capacity. After that initial period the degradation will be relatively stable.

 

[McLovin]

I’d just like to point out the number of times my ICE vehicles have stated I have 250 miles remaining, then, after driving 5 miles, it says 230, then after another 20 miles, it still says 230. So, Rivian isn’t the only company having issues estimating “remaining range”.

I think someone here coined the phrase “guess-o-meter”, and that’s basically what it is. I just look at the % meter, and try to never let it get below 25.

 

[SANZC02]

The estimated range is really hard to rely on. It depends on so many factors and is rarely accurate. Fluctuations and temperature battery health recent driving etc etc

A general rule of thumb is the batteries will degrade most within the first year or two of their life. It's common that within the first couple of years a battery will lose between 5 and 10% on the high end of capacity. After that initial period the degradation will be relatively stable.

I found that to be true on my Tesla, lost a little over 5% in the first 2 years and over the last almost 7 years another 5%, does not seem like it dropped much at all in the last 2.

I have not seen that in my R1S, it’s been 2 years and 28k miles and have not noticed much degradation at all, it still shows 236 at 80% in all purpose which equates to 295 at 100%. I’m on 22s and that is pretty much what I had originally.

I will say I think they released more battery in an OTA a few months in which is probably what I’ve lost but certainly well under 5%. In the Ride menu still showing 129 kWh for capacity.

@BTOR the number you see will adjust based on you driving history so that could be part of your drop. In the charge screen while you are charging there is a button to bring up a window that shows current range and 100% range for the different drive modes. For instance my all purpose mode is 295 @ 100% and 321 in conserve at 100% which is almost 10% over all purpose which pretty much tracks to what I see on the highway.

There is a thread on the forum that shows how to get into the ride menu, search for that as you can see what it reports for battery capacity in one of those screens. I started logging in every few months and my capacity has not changed from 129 kWh over the last year I have been tracking it.


Edit… Here is the post for the ride menu

Edit 2…. Update number 2, looks like Rivian is exposing battery capacity now in ABRP live data. I did not see it there previously.

 

[emoore]

I’d just like to point out the number of times my ICE vehicles have stated I have 250 miles remaining, then, after driving 5 miles, it says 230, then after another 20 miles, it still says 230. So, Rivian isn’t the only company having issues estimating “remaining range”.

I think someone here coined the phrase “guess-o-meter”, and that’s basically what it is. I just look at the % meter, and try to never let it get below 25.

Especially in the winter. Happened all the time in my ICE vehicles but they don’t measure a gas tank in 1% increments like EVs do. So it’s harder to tell that and ICE is losing range in the winter.

 

[DayTripping]

As mentioned most of the rapid degradation happens in the first 6 months to year, but it also seems to set the tone for the outlying years.

Without know the previous owners charging habits as you've mentioned, you are at the mercy of what they started. Not many EV owners I run across on the street even have a clue about good charging habits. Many will charge to 80 or 90% and just leave it there to drive 10-20 miles a day. This will degrade the pack faster than keeping it around 50-55% and charging higher if/when needed and just before you need to leave.

I have 2 Teslas built at the same time. After 3 years, their degradation is only about 2%. I practiced good charging habits with it and the degradation has been minimal. I follow the same approach with my R1T.

 

[BTOR]

As mentioned most of the rapid degradation happens in the first 6 months to year, but it also seems to set the tone for the outlying years.

Without know the previous owners charging habits as you've mentioned, you are at the mercy of what they started. Not many EV owners I run across on the street even have a clue about good charging habits. Many will charge to 80 or 90% and just leave it there to drive 10-20 miles a day. This will degrade the pack faster than keeping it around 50-55% and charging higher if/when needed and just before you need to leave.

I have 2 Teslas built at the same time. After 3 years, their degradation is only about 2%. I practiced good charging habits with it and the degradation has been minimal. I follow the same approach with my R1T.

I’m hoping the previous owner was mindful when charging. I also hope it’s something else and not degradation. At 401 miles that is already 2.2% and that happened over a 2-3 week period with the SOC sitting at ~ 60%.

 

[R1TandMe]

When it gets warmer it will ge back to the original amount

 

[CANCERDOC]

It is an estimate based on your driving conditions and patterns. Highly unlikely the actual battery capacity changed especially since you are good to keep it 20-70%.

 

[beatle]

Not sure if the capacity exposed by the API is a good indicator of battery degradation as it fluctuates, but mine is still at 142.8kwh as measured by ElectraFi.

When new last June it was 142.9, so hardly any degradation according to that.

The battery report shows a loss of 0.39%, or about 0.55kwh.

This will never happen, but I wish Rivian and other EV manufacturers would do away with the range estimate "distance to empty" display and only use a percentage remaining. You can at least turn off miles remaining in the display, but navigation still shows miles remaining at destination. I can see wanting to know how far you can go at your destination in case you need to find another charging point, but it's still a bad metric since it has no idea how fast you'll be going on your next trip, if there will be elevation changes, or if there will be a headwind. The navigation can account for these things pretty well, but without that, seeing miles remaining really only serves to confuse people since it is almost always wrong.

 

[SwampNut]

Do a full charge, and leave it on charge for hours afterward. This resets the BMS and balances all cells. While you shouldn't do this every day, it's important to do it on occasion. My neighbor's three year old Tesla had lost a lot of range, and he had never once charged it full. He did that and gained 30 projected miles.

If you can run it down to very low, say under 5%, it may gain more. My motorcycle did.

 

[BTOR]

Do a full charge, and leave it on charge for hours afterward. This resets the BMS and balances all cells. While you shouldn't do this every day, it's important to do it on occasion. My neighbor's three year old Tesla had lost a lot of range, and he had never once charged it full. He did that and gained 30 projected miles.

If you can run it down to very low, say under 5%, it may gain more. My motorcycle did.

I will be doing a full charge this weekend. We have a 2023 Bolt and we try and do a full charge once a month to reset the BMS.

 

[SwampNut]

Just to be ultra clear, you also have to leave it on charge for quite some time after it hits 100% to give it time to balance. A full balance is very slow. I've watched it on our Tesla and it can be hours.

 

[Seano]

In the past couple of weeks, my max charge limit has dropped from 410 miles to 401 miles at 100% SOC in my 2025 R1S with only 4300 miles. I can’t imagine the batteries have degraded in this short period. The vehicle is only 7 months old. I am the second owner. I took ownership in mid November. I have only logged 500 miles in it since then. I have only charged 4 times, each time when SOC hits ~ 20% then charge to 70% SOC. I don’t know the original owners charging habit since I got it through a dealer. However, I do know l he was a multiple EV owner so I assume he had good charging habits. I know in time the max range value will drop. I just didn’t expect it this soon if that is truly what I am experiencing

Trying to figure out an explanation, if there is one. And, can I expect it to bounce back.

A few things to note. It has been colder the past few weeks with temps ranging from the mid 20’s to low 40’s. Could this be an explanation and when the battery finally gets a chance to warm-up, the max SOC mileage will bounce back up. The battery temp has been sitting around 40° to 45° F and stays there even when driving it.

My vampire drain is very consistent @ 1% every 36-48 hrs. This has not changed since I took ownership. This seems very reasonable since it is charging the low voltage battery.

I have not done a full charge to 100%. I plan to do that this coming weekend prior to departing on a long journey. But when I slide the charge limit to 100% it now says 401 miles. And, as I’ve been planning my trip these past few weeks, it’s declined from 410-401 miles. A couple of weeks ago when I started planning, it said 410 miles.

I have not tried a soft reset but the car was at the SC last week and I am sure they did at least one, but maybe not. Maybe that is worth trying.

Anyone out there have any explanation, thoughts and/or other recommendations?

Our Range Rover does an estimate of mileage left in the tank that **appears** to take driving conditions into account (maybe how hard we're driving it)? Sometimes when I filled up the tank, it would say 370 miles and occasionally as high as 420.

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