Alternator & ChargingOwner reportCommunity Starter

2024 Rivian R1S Dual-Motor — anyone else: Fast charging slows down earlier than it used to

WrenchSeller64Community StarterJan 27, 20262024 Rivian R1S Dual-MotorChicago
On road trips the car used to hold a higher charge rate longer. Now it starts tapering sooner even when the pack is warm. Could this be charger-side variation, battery temperature, software, or an actual battery-health issue? Appreciate any ideas on what to check first.
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PistonTech95Community StarterCommunity StarterJan 27, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 Rivian R1S so service can see what you saw. That's where I'd start. This is from a 2024 Rivian R1S in Chicago. Take it or leave it — that's what I'd do. If the story changes I'll post the new data.
CanyonPilot84Community StarterCommunity StarterJan 27, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2024 Rivian R1S charge sessions. That's where I'd start. Monthly payment math is how wallets disappear. I'll poke at it this weekend.
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