Battery Degradation

[mudito]

What is deeper discharge value ?

Lower than 10% SoC

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[LL75]

Lower than 10% SoC

I think I did that once in 2 and a half year

 

[mudito]

I think I did that once in 2 and a half year

Again, to summarize. Nothing to panic about.

If you fancy testing, deplete your battery as much as possible and charge to 100% once. No harm will be done.

Once it's fully charged, the only thing I would avoid is to store it at 100%. So use it throughout the day and maybe run a 635 loop once here in DFW and I'll go down fairly quick

 

[UnsungZero_OldTimeAdMan]

Cause for concern? Only if you are not following best charging practices. And how do you know the Electrafi data is for sure accurate? you don't.

Time for a NMC refresher? I re-watched it yesterday and re-learned a few things.

 

[Cal]

Been in the ev world since 2013. Three tesla MS's, a Lightning and now a R1T. Member of multiple ev forums and always hear these same questions. I've always just followed the manufacturer recommendations and not tried to cross recommendations. If Rivian recommends 70% daily why do 80%? Because you know more than the manufacturer? I'm not saying occasionally doing 100% for a trip or something is going to hurt anything but that's the real issue. How often is occasionally? Once a month, 6 times in a row on a trip but back home back to 70%.

This is all fun until your battery starts dying prematurely. Heard tons of Lightning owners that bought std range batteries because they couldn't afford a bigger one. Forum gurus assured them 100% daily is fine. I get it but those owners be the first to complain if they think their degradation is too much. Not sure if Ford has the software chops to pull charge stats but I guarantee Tesla can. And that's where the argument ends.

I just plug in when I get home and unplug when I use the car/truck again. Sometimes I'll charge two or three days in a row other times the car will sit for four or five days (fully charged back to 75%). Tesla said don't over think, it just plug in when you get home. Battery replacment for Teslas were something talked about on the Forums. Not much today. They do know a thing or two about BMS's and their batteries.

I've got over 250k ev miles and it's worked well for me.

 

[mudito]

Been in the ev world since 2013. Three tesla MS's, a Lightning and now a R1T. Member of multiple ev forums and always hear these same questions. I've always just followed the manufacturer recommendations and not tried to cross recommendations. If Rivian recommends 70% daily why do 80%? Because you know more than the manufacturer? I'm not saying occasionally doing 100% for a trip or something is going to hurt anything but that's the real issue. How often is occasionally? Once a month, 6 times in a row on a trip but back home back to 70%.

This is all fun until your battery starts dying prematurely. Heard tons of Lightning owners that bought std range batteries because they couldn't afford a bigger one. Forum gurus assured them 100% daily is fine. I get it but those owners be the first to complain if they think their degradation is too much. Not sure if Ford has the software chops to pull charge stats but I guarantee Tesla can. And that's where the argument ends.

I just plug in when I get home and unplug when I use the car/truck again. Sometimes I'll charge two or three days in a row other times the car will sit for four or five days (fully charged back to 75%). Tesla said don't over think, it just plug in when you get home. Battery replacment for Teslas were something talked about on the Forums. Not much today. They do know a thing or two about BMS's and their batteries.

I've got over 250k ev miles and it's worked well for me.

This is Texas, out of nowhere you might need 200mi of range on a normal Thursday. I don't blame him for charging to 80%. He won't cause any harm to the battery with his behavior

 

[UnsungZero_OldTimeAdMan]

Been in the ev world since 2013. Three tesla MS's, a Lightning and now a R1T. Member of multiple ev forums and always hear these same questions. I've always just followed the manufacturer recommendations and not tried to cross recommendations. If Rivian recommends 70% daily why do 80%? Because you know more than the manufacturer? I'm not saying occasionally doing 100% for a trip or something is going to hurt anything but that's the real issue. How often is occasionally? Once a month, 6 times in a row on a trip but back home back to 70%.

This is all fun until your battery starts dying prematurely. Heard tons of Lightning owners that bought std range batteries because they couldn't afford a bigger one. Forum gurus assured them 100% daily is fine. I get it but those owners be the first to complain if they think their degradation is too much. Not sure if Ford has the software chops to pull charge stats but I guarantee Tesla can. And that's where the argument ends.

I just plug in when I get home and unplug when I use the car/truck again. Sometimes I'll charge two or three days in a row other times the car will sit for four or five days (fully charged back to 75%). Tesla said don't over think, it just plug in when you get home. Battery replacment for Teslas were something talked about on the Forums. Not much today. They do know a thing or two about BMS's and their batteries.

I've got over 250k ev miles and it's worked well for me.

70% is a conservative Cover-Your-Ass recommendation. And if you've been observing Rivian, at its young tender age, they tend to be very conservative—in order to avoid unnecessary (and damaging) litigation. 80% on the regular is fine, if that's what is needed to get by. My personal scenario, I can't charge at home, 80% means I don't have to DCFC as often. And my range estimates have not changed since delivery 2+ years ago.

 

[R1T Preds Fan]

I tend to charge up to 80% every 2-3 days and drive till I hit below 20% and repeat… I think charging to 80% is a lot less hard on the battery than cycling an additional charge each week 50+ times a year…

 

[TexasBob]

Going from 80% and discharging to 60% then recharging to 80% is 0.2 cycles. Doing that every day for a year is 73 cycles. Doing it for 20 years will get you to 1,500 cycles.

 

[EricSD858]

I have been noticed my 2023 quad r1s total battery capacity on Electrafi went from 129 kwh earlier this year to now 126.4. ( it was at 126.7 two weeks ago). My vehicle has 41K miles. Is this something I should be concerning about? My charging is to 80% daily and rarely use L3 charging.

136,467 Miles 2025.18.1

Battery 97.2 / 126.9 kWh

Drive Mode All-Purpose

I have a 2022 Quad with the offroad package and use Goodyear Wrangler All Terrain with Kevlar tires. I copied and pasted this from Teslafi/Electrafi. I DC fast charge 99.9% of the time and regularly charge over 85% but don't leave it like that overnight.

 

[LL75]

Been in the ev world since 2013. Three tesla MS's, a Lightning and now a R1T. Member of multiple ev forums and always hear these same questions. I've always just followed the manufacturer recommendations and not tried to cross recommendations. If Rivian recommends 70% daily why do 80%? Because you know more than the manufacturer? I'm not saying occasionally doing 100% for a trip or something is going to hurt anything but that's the real issue. How often is occasionally? Once a month, 6 times in a row on a trip but back home back to 70%.

This is all fun until your battery starts dying prematurely. Heard tons of Lightning owners that bought std range batteries because they couldn't afford a bigger one. Forum gurus assured them 100% daily is fine. I get it but those owners be the first to complain if they think their degradation is too much. Not sure if Ford has the software chops to pull charge stats but I guarantee Tesla can. And that's where the argument ends.

I just plug in when I get home and unplug when I use the car/truck again. Sometimes I'll charge two or three days in a row other times the car will sit for four or five days (fully charged back to 75%). Tesla said don't over think, it just plug in when you get home. Battery replacment for Teslas were something talked about on the Forums. Not much today. They do know a thing or two about BMS's and their batteries.

I've got over 250k ev miles and it's worked well for me.

This definitely not a complaint. More of a slight concern bcz I saw the total battery dipped 3 kWh in 6 months. I had two Tesla model 3s before my two Rivians. One of my model 3 had 120k miles on it. I followed their recommendation 80% and always plugged in. After 3 years , it degraded 15 percent.
We average more than 15k miles a year here. So 70% charge may not cut it for some days in Texas.

 

[swaggner]

I tend to charge up to 80% every 2-3 days and drive till I hit below 20% and repeat… I think charging to 80% is a lot less hard on the battery than cycling an additional charge each week 50+ times a year…

I can see why this makes sense, but it is incorrect. It’s much “easier” on this type of chemistry to charge from 70-80% ten times (for a total of 100%) then to charge from 0-100% once.

There’s a good Engineering Explained video about how this rationale.

 

[zefram47]

What is deeper discharge value ?

I typically charge to 70% daily, though infrequently to 85-94% (or even 100% if I actually need it) for the odd longer trip. Most days I don't dip below 50% and I charge daily. As someone else mentioned in this thread, Engineering Explained and others have some good videos talking about various lithium battery chemistries and the smaller the range of the battery typically used the better and somewhere around 50-70% is kind of "good for it". But you paid for the whole battery, so if you actually need the range, use it and don't overthink it. Just don't leave it at high (or low) state of charge for long periods of time, especially if it's very hot or very cold.

If you occasionally let it go lower in the pack, 10-20% or something and charge it up to 100% or closer to it than the daily 70% it can help the BMS recalibrate itself. For the folks with an LFP battery vs the NMC, you actually need to go to 100% somewhat more frequently because the voltage doesn't change significantly with LFP until you're near a full charge, so the BMS can get "confused" after awhile if it doesn't frequently get past the sharp transition in voltage. Currently, the only LFP Rivians are going to be the Standard pack trucks. That's why I mentioned that I had need to do a deeper charge, in this case I went to 94% because I live on a hill and beyond that you lose most of your regen until you discharge below 94% again, and the ElectraFi data did show an "increase" in battery capacity after I exercised more of it over the past few days.

 

[R1T Preds Fan]

I can see why this makes sense, but it is incorrect. It’s much “easier” on this type of chemistry to charge from 70-80% ten times (for a total of 100%) then to charge from 0-100% once.

There’s a good Engineering Explained video about how this rationale.

Except I never find myself charging from 60%-80%…
For nearly the first year I tried keeping it limited to 70% unless travel dictated needing more… and I’d get two days between charges; a third would dip me between 10%-20%…
Bumping up to 80% allows me to generally get three days between charging and plugging in the range of 20%-30%…
I alternate charging between the truck and a M3 and don’t charge either vehicle daily at the top half of the battery…

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