Tesla Model 3 key fob battery
8 of the 10 model years listed for the Tesla Model 3 have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2017-2023Key fob
CR2032
Owner's manual: tesla.com and shop.tesla.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2024Key fob
CR2032
Owner's manual: tesla.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2025-2026Key fob
Not confirmed yet
Changing the battery
Separate remote fob
- The remote is a small standalone unit. You will not need to touch the ignition key at all.
- Find the slot along the edge and turn a coin in it. Go slowly so the clips do not snap.
- Replace the cell, keeping the + side where it was, and check the small metal tab still touches it.
- Close the fob and test it. If it does not work, open it again and check the cell is seated flat.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.