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Question: How are you estimating real battery degradation?

QuietDailyCommunity StarterMay 26, 20262023 Rivian R1T Quad-MotorPennsylvania
Dash range changes with temperature and driving, so I'm looking for a better way to judge battery health. What data do you trust—usable kWh, charging energy, service-mode values, repeated range tests? Any data points from owners would help.
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25 replies

EuroSeller14Community StarterCommunity StarterMay 26, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. I'd want that in writing, not as a promise. Video is ugly but it shows the hesitation.
V8Hauler14Community StarterCommunity StarterMay 26, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. This is from a 2023 Rivian R1T in Pennsylvania. Learned this the expensive way on a previous car. I'd rather be boring and correct. Checking again after work.
V8Hauler14Community StarterCommunity StarterMay 26, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. A shop burned me once by skipping that step. Only after sitting overnight so far.
PixelTraveler15Community StarterCommunity StarterMay 26, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. I'd do that before spending real money. Keep sale price, fees, and rate as three different conversations. That's coming from doing this as an owner, not a shop. Happens in gear, not in park, for what that's worth.
PixelTraveler15Community StarterCommunity StarterMay 27, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. I'd do that before spending real money. Write the result down so the next test isn't a repeat of the last one. If the story changes I'll post the new data.
EuroSeller14Community StarterCommunity StarterMay 27, 2026permalink
Fair point. Counterpoint: Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. Verbal 'we'll take care of it' is not a plan. I've seen both outcomes, which is why I'd test instead of assume. I'd rather look cautious in this thread than stuck later.
BoostedRider9Community StarterCommunity StarterMay 27, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “how are you estimating real battery degradation,” that was the fork that mattered for me. Not gospel, but it saved me a headache. I keep a notes app thread for this now.
SmoothMechanicish18Community StarterCommunity StarterMay 27, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. Happy to compare notes if your setup is different. I'll update if anything new shows up.
EuroSeller14Community StarterCommunity StarterMay 27, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Verbal 'we'll take care of it' is not a plan. I've seen both outcomes, which is why I'd test instead of assume. Cold start is when I can actually reproduce it.
V8Hauler14Community StarterCommunity StarterMay 27, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. A shop burned me once by skipping that step. I'll poke at it this weekend.
WrenchScout82Community StarterCommunity StarterMay 27, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “how are you estimating real battery degradation,” that was the fork that mattered for me. When does it actually happen? If your situation is the opposite, ignore me. I'm in no rush to be a hero on it.
V8Hauler14Community StarterCommunity StarterMay 27, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. That's where I'd start. A shop burned me once by skipping that step. Happens in gear, not in park, for what that's worth.
ApexRunnerCommunity StarterCommunity StarterMay 27, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. Then you'll know the next fork. Was this after sitting overnight? I'll poke at it this weekend.
NewCarTraveler47Community StarterCommunity StarterMay 27, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. Then you'll know the next fork. If it doesn't change the out-the-door or the repair estimate, it's noise. If this is nothing, great. I want that in data.
BoxerNomadCommunity StarterCommunity StarterMay 28, 2026permalink
Agree — and I'd add this: Leave the alerts on the 2023 Rivian R1T so service can see what you saw. I'd do that before spending real money. If it doesn't change the out-the-door or the repair estimate, it's noise. No warning lights, which is why I'm documenting it.
BoostedRider9Community StarterCommunity StarterMay 29, 2026permalink
Not convinced that's the whole story. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. I'd do that before spending real money. Just my two cents from doing this recently. Video is ugly but it shows the hesitation.
PixelNerd71Community StarterCommunity StarterMay 27, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “how are you estimating real battery degradation,” that was the fork that mattered for me. This is from a 2023 Rivian R1T in Pennsylvania. Take it or leave it — that's what I'd do. If your situation is the opposite, ignore me. Parking it somewhere I can hear it better next time.
V8Hauler14Community StarterCommunity StarterMay 27, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. That's where I'd start. Had a similar mess a couple years ago and that's what finally sorted it. Make the next action something you can finish this week. I refuse to clear codes until someone else sees them.
PixelTraveler15Community StarterCommunity StarterMay 28, 2026permalink
Quick add on that: On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “how are you estimating real battery degradation,” that was the fork that mattered for me. This is from a 2023 Rivian R1T in Pennsylvania. Keep sale price, fees, and rate as three different conversations. Climate here is different, so treat that as a local data point. I'll update if anything new shows up.
QuietDailyCommunity StarterCommunity StarterMay 27, 2026permalink
Checked the easy stuff on the 2023 Rivian R1T and found one clue worth chasing before I book a shop. I'm in no rush to be a hero on it.
QuietDailyCommunity StarterCommunity StarterMay 28, 2026permalink
Update: the cheap test changed the symptom, so I'm not throwing parts yet. Not driving it hard until I know more.
BoostedRider9Community StarterCommunity StarterMay 28, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Not gospel, but it saved me a headache. I'm keeping receipts and dates in one folder.
PixelNerd71Community StarterCommunity StarterMay 28, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “how are you estimating real battery degradation,” that was the fork that mattered for me. Not gospel, but it saved me a headache. Heat soak after errands is the other window.
QuattroGuy93Community StarterCommunity StarterMay 28, 2026permalink
Agree — and I'd add this: On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “how are you estimating real battery degradation,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. If it repeats twice more I'll book time.
EuroSeller14Community StarterCommunity StarterMay 28, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. Then you'll know the next fork. Verbal 'we'll take care of it' is not a plan. I've seen both outcomes, which is why I'd test instead of assume. I refuse to clear codes until someone else sees them.
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