Toyota Prius key fob battery
10 of the 26 model years listed for the Toyota Prius 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.
- 2001-2003Remote (separate)
Not confirmed yet
- 2001-2003Remote (separate, 3-button 89742-20200)
Not confirmed yet
- 2004-2009Smart key (Smart Entry)
CR2032
FCC ID MOZB31EGTwo sites agree: uhs-hardware.com and americankeysupply.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2010-2011Unknown
Not confirmed yet
- 2012Smart key (electronic key)
CR1632
Two sites agree: americankeysupply.com and uhs-hardware.com (checked Nov 2, 2026)
Find CR1632 on Amazon - 2013-2015Unknown
Not confirmed yet
- 2016Smart key (electronic key)
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Use a CR2032 lithium battery”
Find CR2032 on Amazon - 2017-2018Unknown
Not confirmed yet
- 2019Smart key (electronic key)
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “Electronic key battery ... Lithium battery CR2032”
Find CR2032 on Amazon - 2020-2022Unknown
Not confirmed yet
- 2023-2025Smart key
Not confirmed yet
- 2026Smart key (electronic key)
CR2450
Owner's manual: manua.ls and amanuals.com (checked Nov 1, 2026)
Manual text: “Use a CR2450 lithium battery”
Find CR2450 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.
- Use the slot where the metal key sat. Twist, do not lever hard, and work along the seam until the halves separate.
- 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.
- Snap the halves back together, slide the metal key home, and press each button, then try the start button from the driver's seat.
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 CR1632 is 16 mm across and 3.2 mm thick. It is easy to confuse with the 20 mm CR20xx sizes, which will not fit.
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.
A CR2450 is 24.5 mm across and 5.0 mm thick, much fatter than a CR2032. A thinner cell will rattle and lose contact, so buy the exact size.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.