Mazda Millenia key fob battery
1 of the 7 model years listed for the Mazda Millenia 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.
- 1996-1999Remote (separate)
Not confirmed yet
- 2000Remote (separate)
Not confirmed yet
- 2001Unknown
Not confirmed yet
- 2002Remote (separate)
CR2025
Owner's manual: manualowl.com (checked Nov 1, 2026)
Manual text: “CR2025 or the equivalent”
Find CR2025 on Amazon
Changing the battery
Separate remote fob
- A separate fob has no key blade inside, so it opens with nothing but a coin or a small screwdriver.
- Find the slot along the edge and turn a coin in it. Go slowly so the clips do not snap.
- Swap the cell or cells, keeping the same side up as the old ones.
- 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.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.