Mazda MX-5 Miata key fob battery
13 of the 31 model years listed for the Mazda MX-5 Miata have a proven battery. The most common answer is CR2025. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 1996-2000Unknown
Not confirmed yet
- 2001Remote (separate)
Not confirmed yet
- 2002Remote (separate)
CR2025
Owner's manual: manualowl.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2025 or the equivalent).”
Find CR2025 on Amazon - 2003Remote/transmitter (form not stated)
CR2025
Owner's manual: manualowl.com (checked Nov 1, 2026)
Manual text: “CR2025 or the equivalent”
Find CR2025 on Amazon - 2004Remote (separate)
CR2025
Owner's manual: manualowl.com (checked Nov 1, 2026)
Manual text: “CR2025 or equivalent”
Find CR2025 on Amazon - 2005Flip key (retractable type key)
CR1620
Owner's manual: manualowl.com (checked Nov 1, 2026)
Manual text: “Retractable key type: CR1620 or equivalent”
Find CR1620 on Amazon - 2005Remote (separate, non-retractable key type)
CR2025
Owner's manual: manualowl.com (checked Nov 1, 2026)
Manual text: “Non-retractable key type: CR2025 or equivalent”
Find CR2025 on Amazon - 2005-2006Smart key
Not confirmed yet
- 2006Flip key
Not confirmed yet
- 2007Flip key (retractable type key)
Not confirmed yet
- 2007Smart key (advanced key)
Not confirmed yet
- 2008-2013Flip key
Not confirmed yet
- 2008-2013Smart key
Not confirmed yet
- 2014Flip key
Not confirmed yet
- 2014Smart key
Not confirmed yet
- 2015Flip key
CR1620
Two sites agree: mazdausa.com and energizer.com (checked Nov 2, 2026)
Find CR1620 on Amazon - 2015Smart key (advanced key)
CR2025
Two sites agree: mazdausa.com and energizer.com (checked Nov 2, 2026)
Find CR2025 on Amazon - 2016Smart key
CR2025
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2025 or equivalent).”
Find CR2025 on Amazon - 2017Smart key
CR2025
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2025 or equivalent).”
Find CR2025 on Amazon - 2018Smart key
CR2025
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2025 or equivalent).”
Find CR2025 on Amazon - 2019Smart key
CR2025
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2025 or equivalent).”
Find CR2025 on Amazon - 2020Smart key (Type A, with auxiliary key slot)
CR2025
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Type A: Use CR2025 or an equivalent.”
Find CR2025 on Amazon - 2020Smart key (Type B)
CR2032
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Type B: Use CR2032 or an equivalent.”
Find CR2032 on Amazon - 2021Smart key
CR2032
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2032 or equivalent).”
Find CR2032 on Amazon - 2022Smart key
CR2032
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2032 or equivalent).”
Find CR2032 on Amazon - 2023Smart key
CR2032
Owner's manual: mazdausa.com (checked Nov 1, 2026)
Manual text: “Replace only with the same type battery (CR2032 or equivalent).”
Find CR2032 on Amazon - 2024-2025Smart key
Not confirmed yet
- 2026Unknown
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.
- Lift the old coin cell out and press the new one in with matching orientation.
- Reassemble and test from a short distance.
A CR2025 is 20 mm across and 2.5 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.
Flip key
- Swing the key blade open first. On most flip keys the cell lives in the body behind the hinge.
- Some flip keys have a screw on the back; others just clip. Remove the screw if there is one, then pry gently at the seam.
- Lift the cell out with a plastic tool and press in the new one with the + side matching.
- Close it up, check the blade still flips cleanly, and test the buttons at the car.
A CR1620 is 16 mm across and 2.0 mm thick. It is easy to confuse with the 20 mm CR20xx sizes, which will not fit.
A CR2025 is 20 mm across and 2.5 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.
Smart key (push-button start)
- Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
- 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.
- Close the case until it clicks all the way round, put the metal key back, then try the buttons and a push-button start.
Mazda advanced keys usually have a knob or button that frees the auxiliary key; the cover lifts once the key is out.
A CR2025 is 20 mm across and 2.5 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 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.