Lexus RZ key fob battery
Every model year listed for the Lexus RZ has 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.
- 2023-2024Smart key
CR2032
FCC ID HYQ14FLCTwo sites agree: bestkeysupply.com and americankeysupply.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2025Smart key
CR2032
FCC ID HYQ14FLCTwo sites agree: bestkeysupply.com and americankeysupply.com (checked Nov 2, 2026)
Find CR2032 on Amazon - 2026Smart key (electronic key)
CR2032
Owner's manual: manua.ls and amanuals.com (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.
- The gap left by the metal key usually has a pry point. A slow twist with a thin flat tool (tape on the tip saves the plastic) opens the two halves.
- 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.
Lexus smart keys usually hide the metal key behind a release button; the cover opens from the notch next to where the key sat.
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.