Alternator & ChargingBuying adviceCommunity Starter

Fast charging slows down earlier than it used to

BoxerNomadCommunity StarterMar 11, 20262024 Rivian R1S Dual-MotorUpstate New York
2024 Rivian R1S Dual-Motor, about 62,000 miles. 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? Trying to diagnose before I book a shop.
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4 replies

RotorHauler24Community StarterCommunity StarterMar 11, 2026permalink
Hard-won lesson from my last deal: A written buyer’s order on the 2024 Rivian R1S is worth more than any verbal “we’ll make it work.” I'd rather lose the car than buy a foggy deal. On “fast charging slows down earlier than it,” that was the fork that mattered for me. Not gospel, but it saved me a headache. Climate here is different, so treat that as a local data point. If GAP is bundled I'm making them unbundle it.
RoadPilotCommunity StarterCommunity StarterMar 11, 2026permalink
If I were shopping this, i would not wire money until I've seen the 2024 Rivian R1S and the title situation in person or via a trusted PPI. Screenshot the worksheet if you can. Had a similar mess a couple years ago and that's what finally sorted it. Doing the boring step first on purpose.
BoxerNomadCommunity StarterCommunity StarterMar 11, 2026permalink
Walked a dealership this week on the 2024 Rivian R1S (62,000 miles) and the doc fee was the tell. This is the version I'd tell a friend.
RoadPilotCommunity StarterCommunity StarterMar 12, 2026permalink
I'd slow the salesperson down here. In Upstate New York, insurance quotes flipped a 2024 Rivian R1S comparison for me more than the sale price did. Screenshot the worksheet if you can. This is from a 2024 Rivian R1S in Upstate New York with 62,000 miles. A shop burned me once by skipping that step. A day of patience here is cheaper than a wrong part. Calling insurance in the morning before I reply to the desk.
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