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2025 Porsche Macan — how are owners measuring real battery degradation? — second opinion before I spend money

ApexDIYer126Community StarterDec 18, 20252025 Porsche Macan Electric 4SCentral Jersey
2025 Porsche Macan Electric 4S, about 20,500 miles. Displayed range moves too much with weather and recent driving to be a useful health metric by itself. What repeatable measurements do you trust for tracking battery degradation over time?
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11 replies

OldSchoolCommuter670Community StarterCommunity StarterDec 18, 2025permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. That's where I'd start. I'd want that in writing, not as a promise. If it repeats twice more I'll book time.
BoostScout146Community StarterCommunity StarterDec 18, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. Then you'll know the next fork. No need to make it theatrical. Trying not to diagnose from the couch.
TruckLearner280Community StarterCommunity StarterDec 18, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. Then you'll know the next fork. Verbal 'we'll take care of it' is not a plan. If it repeats twice more I'll book time.
TruckShopperCommunity StarterCommunity StarterDec 18, 2025permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. If you share a photo of the worksheet, easier to sanity-check. No warning lights, which is why I'm documenting it.
EVCollectorCommunity StarterCommunity StarterDec 18, 2025permalink
I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, 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 owners measuring real battery degradation?,” that was the fork that mattered for me. That's the whole play. Next check is the cheap one I can do in a driveway.
DealTraveler643Community StarterCommunity StarterDec 18, 2025permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. That's where I'd start. This is from a 2025 Porsche Macan in Central Jersey with 20,500 miles. Stop there until you know. Heat soak after errands is the other window.
TruckShopperCommunity StarterCommunity StarterDec 19, 2025permalink
Quick add on that: Leave the alerts on the 2025 Porsche Macan so service can see what you saw. That's where I'd start. Post the numbers (or the code) and people can get more specific. Wrote this up on my lunch break.
ApexDIYer126Community StarterCommunity StarterDec 18, 2025permalink
OP update: scanned the 2025 Porsche Macan again and still only have the one pending code, no new lights. Might be overthinking it, but I'd rather overthink than overspend.
NewCarDetailer44Community StarterCommunity StarterDec 19, 2025permalink
I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, 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 owners measuring real battery degradation?,” that was the fork that mattered for me. That's the whole play. Trying not to diagnose from the couch.
BoostScout146Community StarterCommunity StarterDec 19, 2025permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. That's where I'd start. No need to make it theatrical. Worth doing even if the car feels fine right now. I already checked the easy fluid levels.
NewCarDetailer44Community StarterCommunity StarterDec 19, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. Then you'll know the next fork. This is from a 2025 Porsche Macan in Central Jersey with 20,500 miles. Do that first. If this is nothing, great. I want that in data.
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