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Mazda Axela Smart Key & Remote Battery by Chassis Code
Which battery is used in the documented key system? Compare actual published manufacturer references for 5 exact Mazda Axela chassis codes. Values can differ across drivetrain, trim and production period.
5documented chassis
1answer shared by every code
2source documents
2026-10-05latest evidence review
Before applying a specification
View all Mazda Axela chassis →Confirm the engineering configuration
Different key or remote variants may ship with different coin cells even within the same model family. Match the actual fob, not just the vehicle name.
Year ranges here describe the cited chassis coverage, not every option sold under the same model name worldwide. The actual service manual and fitted equipment take precedence.
Source-linked answers
Smart Key & Remote Battery: chassis comparison
Open the original exact-code answer to see the manufacturer reference and full caveat.
| Exact code | Documented years | Key battery reference | Manufacturer source |
|---|---|---|---|
| BM2AS | 2018–2019 | CR2025 ↗ | Mazda Motor Corporation ↗Checked 2026-10-05 |
| BM2FS | 2018–2019 | CR2025 ↗ | Mazda Motor Corporation ↗Checked 2026-10-05 |
| BM5AS | 2018–2019 | CR2025 ↗ | Mazda Motor Corporation ↗Checked 2026-10-05 |
| BM5FS | 2013–2017 | CR2025 ↗ | Mazda Motor Corporation ↗Checked 2026-09-27 |
| BMLFS | 2018–2019 | CR2025 ↗ | Mazda Motor Corporation ↗Checked 2026-10-05 |
Documented differences
Which codes share an answer?
Grouped by exact published text. Similar wording is not treated as proof of identical equipment.
Reviewable evidence
Source scope and important caveats
Mazda Axela BM2AS — Key fob battery ↗
Published answer: CR2025
Mazda specifies a CR2025 lithium battery for the documented Axela BN key.
Applicability: Replace when the key range becomes unstable or the indicator no longer lights; confirm the key design for the exact production period.
Mazda Axela BN key battery replacement · Mazda Motor Corporation · Manufacturer reference ↗
Mazda Axela BM2FS — Key fob battery ↗
Published answer: CR2025
Mazda specifies a CR2025 lithium battery for the documented Axela BN key.
Applicability: Replace when the key range becomes unstable or the indicator no longer lights; confirm the key design for the exact production period.
Mazda Axela BN key battery replacement · Mazda Motor Corporation · Manufacturer reference ↗
Mazda Axela BM5AS — Key fob battery ↗
Published answer: CR2025
Mazda specifies a CR2025 lithium battery for the documented Axela BN key.
Applicability: Replace when the key range becomes unstable or the indicator no longer lights; confirm the key design for the exact production period.
Mazda Axela BN key battery replacement · Mazda Motor Corporation · Manufacturer reference ↗
Mazda Axela BM5FS — Key fob battery ↗
Published answer: CR2025
Mazda's Axela owner manual specifies a CR2025 lithium coin cell for the Advanced Key used on the BM-generation Axela.
Applicability: Mazda recommends dealer replacement to avoid damaging the key. Confirm that your key case matches the manual before opening it.
Mazda Japan Axela owner manual · Mazda Motor Corporation · Manufacturer reference ↗
Mazda Axela BMLFS — Key fob battery ↗
Published answer: CR2025
Mazda specifies a CR2025 lithium battery for the documented Axela BN key.
Applicability: Replace when the key range becomes unstable or the indicator no longer lights; confirm the key design for the exact production period.
Mazda Axela BN key battery replacement · Mazda Motor Corporation · Manufacturer reference ↗