2016–2019 Mazda CX-9 key fob battery
The 2016–2019 Mazda CX-9 key fob takes a CR2025, a 20 × 2.5 mm 3 V lithium cell. Below: how to open it, what to do if it dies, and the manual we checked.
Buy CR2025 batteries CR2025 specs & equivalents
Tip: buy a multi-pack and change the spare key at the same time. Both cells usually age together.
Quick facts
Before you start
- Get a new CR2025 cell from a fresh pack.
- Work over a table or soft cloth so small parts and buttons don’t get lost.
- Note which way the old battery faces before you take it out.
- Keep loose coin cells away from children and pets. See coin battery safety.
How to replace the 2016–2019 Mazda CX-9 key fob battery
- Press the release knob and pull the metal emergency key out of the fob
- Wrap the tip of a small flat screwdriver in tape, slip it into the gap and twist gently to pop the cover off
- Lift off the battery cap and remove the old cell
- Check the rubber seal is seated, then fit the new CR2025 with the + side facing up
- Refit the cap and cover, then slide the metal key back in
Confirmed in the 2016, 2017, 2018 and 2019 CX-9 owner's manuals (same CR2025 key). Mazda recommends a dealer if you are unsure.
After you change the battery
- Press lock and unlock from a few metres away. The car should react on the first press.
- On push-button start cars, start the engine once with the fob in your pocket.
- If nothing happens, re-open the fob and check the battery direction and contacts. More fixes: key fob not working after a battery change.
About the CR2025 battery
CR2025 is a 20 mm × 2.5 mm, 3 V lithium cell with a typical capacity of about 160 mAh. The same size is sold as DL2025, ECR2025, 5003LC. A CR2012 or CR2016 has the same diameter but is thinner, so it can fit loosely and runs down sooner. Stick with CR2025.
Photos from Mazda CX-9 owners
No owner photos yet for this generation.
Other vehicles that use a CR2025
2016–2018 Mazda CX-32020 Mazda CX-52017–2019 Mazda CX-52016–2019 Mazda Mazda62016–2019 Mazda MX-5 Miata
Other Mazda CX-9 years
Questions
What battery does the 2016–2019 Mazda CX-9 key fob use?
1 × CR2025 (smart key).
How many batteries does the 2016–2019 Mazda CX-9 key fob need?
1 CR2025 cell.
Can I use a CR2012 or CR2016 instead of a CR2025?
It has the same 20 mm diameter but is thinner, so it can lose contact and runs down sooner. Use a CR2025.
Which battery names are the same as CR2025?
DL2025, ECR2025, 5003LC are the same size as CR2025.
Do I need to reprogram the key after changing the battery?
Most key fobs keep their pairing when the battery is changed. If the fob stops working, check the battery direction and contacts first; our troubleshooting guide covers the rest.
Related guides
Fob not working after a battery change?Signs the fob battery is dyingStarting a car with a dead fobCR2032 vs CR2025 vs CR2016