Mazda MX-5 key fob battery (2019 on): CR2025 or CR2032
It depends on the key: type A key (auxiliary key pulls straight out) takes one CR2025; type B key (removable lower cover) takes one CR2032.
Type A key (auxiliary key pulls straight out)
CR2025× 13V lithium coin cell
Also sold as DL2025, ECR2025, KECR2025 · CR2025 details
Source: Mazda MX-5 owner's manual
Type B key (removable lower cover)
CR2032× 13V lithium coin cell
Also sold as DL2032, ECR2032, KECR2032, 5004LC · CR2032 details
Source: Mazda MX-5 owner's manual
Before you swap it
- CR2016 and CR2032 are the same 20 mm width as a CR2025 but a different thickness, so read the code on the old cell before you order, because a cell that's too thin can lose contact every time the fob gets knocked.
- Car still ignoring the fob after a new cell? Check it went in the right way up. The + side usually faces the marking inside the case.
Quick answers
What battery does the Mazda MX-5 key (2019 on) take?
Type A key (auxiliary key pulls straight out): one CR2025 3V lithium coin cell. Type B key (removable lower cover): one CR2032 3V lithium coin cell.
Is DL2025 the same as CR2025?
Yes. DL2025 is CR2025, and DL2032 is CR2032: same cells, other names.
Will a CR2032 fit instead of a CR2025?
No. It's the same 20 mm width but 3.2 mm thick, against 2.5 mm for a CR2025. Use a CR2025.