HV Battery Health & RangeDIYCommunity Starter

How are you estimating real battery degradation?

ApexCommuterCommunity StarterDec 25, 20252024 Polestar 2 Long Range Dual MotorNationwide
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? If I fix it I'll come back and update the thread.
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10 replies

ShiftWeekend72Community StarterCommunity StarterDec 25, 2025permalink
I'd treat 12V warnings as a no-ignore. On the 2024 Polestar 2, 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. That's the whole play. This is the filter I use when the thread starts repeating itself. This is me being the wet blanket on purpose.
EVMiles31Community StarterCommunity StarterDec 26, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 Polestar 2 — site sharing and pack temp change the curve a lot. Then you'll know the next fork. Take it or leave it — that's what I'd do. Worth doing even if the car feels fine right now. If this is nothing, great. I want that in data.
EVMiles31Community StarterCommunity StarterDec 26, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 Polestar 2 so service can see what you saw. Then you'll know the next fork. Just my two cents from doing this recently. I'd rather pay for diagnosis than a second guess-repair.
EVGuy5Community StarterCommunity StarterDec 26, 2025permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 Polestar 2 charge sessions. I'd do that before spending real money. If it doesn't change the out-the-door or the repair estimate, it's noise. Make the next action something you can finish this week. Checking again after work.
ShiftWeekend72Community StarterCommunity StarterDec 26, 2025permalink
I'd treat 12V warnings as a no-ignore. On the 2024 Polestar 2, 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. This is from a 2024 Polestar 2 in Nationwide. Do that first. Climate here is different, so treat that as a local data point. This is me being the wet blanket on purpose.
ApexCommuterCommunity StarterCommunity StarterDec 26, 2025permalink
Checked the easy stuff on the 2024 Polestar 2 and found one clue worth chasing before I book a shop. I'd rather pay for diagnosis than a second guess-repair.
TruckMiles96Community StarterCommunity StarterDec 26, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 Polestar 2 — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Did the worksheet show tax yet? This is the version I'd tell a friend.
OldSchoolOwner10Community StarterCommunity StarterDec 26, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 Polestar 2 — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Was this after sitting overnight? Worth doing even if the car feels fine right now. I'll poke at it this weekend.
EVGuy5Community StarterCommunity StarterDec 27, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 Polestar 2 so service can see what you saw. Then you'll know the next fork. If it doesn't change the out-the-door or the repair estimate, it's noise. If it repeats twice more I'll book time.
TruckMomCommunity StarterCommunity StarterDec 27, 2025permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 Polestar 2 charge sessions. That's where I'd start. Monthly payment math is how wallets disappear. That's coming from doing this as an owner, not a shop. No warning lights, which is why I'm documenting it.
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