Rivian R1S key fob battery
2 of the 5 model years listed for the Rivian R1S have a proven battery. The most common answer is CR2477. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2022-2024Smart key
Not confirmed yet
- 2022-2024Smart key (KFB 2.0 / Gen 2 key fob)
Not confirmed yet
- 2025-2026Smart key
CR2477
Two sites agree: gearshop.rivian.com and manuals.plus (checked Nov 1, 2026)
Find CR2477 on Amazon
Changing the battery
Smart key (push-button start)
- Most push-button fobs hide a metal backup key. Press or slide its catch and draw the key out first.
- Use the slot where the metal key sat. Twist, do not lever hard, and work along the seam until the halves separate.
- Note which side of the old coin cell faces up (usually the side with the writing), lift it out with a plastic tool, and press the new one in the same way.
- Reassemble, refit the emergency key, and check that the car sees the fob when you press start.
Buy the exact size printed on the old cell (CR2477). The first two digits are the width in millimetres and the last two are the thickness in tenths of a millimetre.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.