How are you estimating real battery degradation?

OP update: scanned the 2025 Porsche Macan again and still only have the one pending code, no new lights. I'd rather look cautious in this thread than stuck later.

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 you estimating real battery degradation,” that was the fork that mattered for me. When does it actually happen? Not interested in a five-hour wait for a shrug.

Checked the easy stuff on the 2025 Porsche Macan and found one clue worth chasing before I book a shop. Wrote this up on my lunch break.

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 Nashville. I'd want a dollar figure or a measured spec, not 'should be fine.' If that fails I'll eat the diagnostic fee.

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. 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. No warning lights, which is why I'm documenting it.