How to Replace a Mazda Axela BM5FS Key-Fob Battery
Replace the Mazda Axela BM5FS key-fob battery using the manufacturer-backed CR2025 service reference.
Mazda's Axela owner manual specifies a CR2025 lithium coin cell for the Advanced Key used on the BM-generation Axela.
Open verified BM5FS reference →What you need
- CR2025 coin-cell battery
- Small flat plastic pry tool
Step by step
- 1
Confirm the BM5FS key
Check that the key and exact vehicle code match the linked BM5FS reference.
- 2
Remove the auxiliary key
Release the mechanical key from the transmitter.
- 3
Open the transmitter
Work around the housing seam carefully with a non-marring tool rather than forcing one corner.
- 4
Note the cell orientation
Observe the installed battery polarity before removal.
- 5
Install the CR2025
Fit the fresh CR2025 in the same orientation, ensuring the contacts are not bent.
- 6
Reassemble and test
Close the housing completely, reinstall the auxiliary key and test the transmitter.