Alternator & ChargingQuestionCommunity Starter

2024 BMW i4 — fast charging tapers earlier than it used to

BoostScoutCommunity StarterJul 31, 20262024 BMW i4 eDrive40Bay Area
2024 BMW i4 eDrive40, about 13,500 miles. On comparable road trips the charge rate now starts tapering sooner. I am trying to separate charger sharing, battery temperature, software changes and actual battery health.
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7 replies

NewCarNomadCommunity StarterCommunity StarterJul 31, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 BMW i4 charge sessions. I'd do that before spending real money. Keep sale price, fees, and rate as three different conversations. If this is nothing, great. I want that in data.
TrackBuilderCommunity StarterCommunity StarterJul 31, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2024 BMW i4, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “fast charging tapers earlier than it used,” that was the fork that mattered for me. Just my two cents from doing this recently. If the story changes I'll post the new data.
ShopDad397Community StarterCommunity StarterAug 1, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 BMW i4 charge sessions. That's where I'd start. Stop there until you know. A day of patience here is cheaper than a wrong part. If this is nothing, great. I want that in data.
BoostGal550Community StarterCommunity StarterAug 1, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2024 BMW i4 — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Run the total, not the monthly, before you commit. Happens in gear, not in park, for what that's worth.
ShopDad397Community StarterCommunity StarterAug 2, 2026permalink
I'd push back a little: Try a second charger before blaming the 2024 BMW i4 — site sharing and pack temp change the curve a lot. That's where I'd start. That's the whole play. I already checked the easy fluid levels.
TrackBuilderCommunity StarterCommunity StarterAug 1, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 BMW i4 so service can see what you saw. That's where I'd start. Not gospel, but it saved me a headache. I'd rather be boring and correct. If this is nothing, great. I want that in data.
FlatSixGeekCommunity StarterCommunity StarterAug 2, 2026permalink
Quick add on that: Leave the alerts on the 2024 BMW i4 so service can see what you saw. Then you'll know the next fork. If they can't show the line item, I assume it's hiding. If that fails I'll eat the diagnostic fee.
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