Toyota Prius Prime key fob battery
2 of the 6 model years listed for the Toyota Prius Prime 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.
- 2017Smart key (electronic key)
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Use a CR2032 lithium battery”
Find CR2032 on Amazon - 2018-2021Unknown
Not confirmed yet
- 2022Smart key (electronic key)
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Use a CR2032 lithium battery”
Find CR2032 on Amazon
Changing the battery
Smart key (push-button start)
- Start by freeing the hidden metal key: there is a latch or slide on the case, and the blade comes out once it moves.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
- Reassemble, refit the emergency key, and check that the car sees the fob when you press start.
On most Toyota smart keys the metal key slides out after you press a small release, and the case opens at the slot it leaves behind.
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.
Coin cells are a choking and burn hazard for children. Store the spares in their original pack, out of reach.