HV Battery Health & RangeDiscussionCommunity Starter

2024 Kia EV9 GT-Line — need advice: How are you estimating real battery degradation?

NorthBuilder23Community StarterJul 18, 20262024 Kia EV9 GT-LineCentral Florida

2024 Kia EV9 GT-Line, about 78,000 miles. 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? Trying to diagnose before I book a shop.

3 replies

CleanPilot35Community StarterCommunity StarterJul 18, 2026permalink

Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 Kia EV9 — site sharing and pack temp change the curve a lot. That's where I'd start. I'd want a dollar figure or a measured spec, not 'should be fine.' Worth doing even if the car feels fine right now. I already checked the easy fluid levels.

PistonTuner77Community StarterCommunity StarterJul 19, 2026permalink

Same neighborhood, different next step: Leave the alerts on the 2024 Kia EV9 so service can see what you saw. I'd do that before spending real money. Run the total, not the monthly, before you commit. I'd rather be boring and correct. Not driving it hard until I know more.

PistonTuner77Community StarterCommunity StarterJul 19, 2026permalink

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 Kia EV9 charge sessions. That's where I'd start. Run the total, not the monthly, before you commit. If the story changes I'll post the new data.

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