Ford Focus key battery
Mk4 (C519)
2018–2024How to change a smart key battery
- Slide the release catch and pull out the emergency key blade.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot the blade leaves and twist gently to part the case. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new CR2032 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
How to change a flip remote battery
- Fold the blade in. On many flip keys the remote section unclips from the blade section, so look for a small slot along the seam.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot and twist gently to part the case. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new CR2032 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
Mk3 / Mk3.5 (C346)
2011–2018How to change a flip remote battery
- Fold the blade in. On many flip keys the remote section unclips from the blade section, so look for a small slot along the seam.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot and twist gently to part the case. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new CR2032 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
How to change a smart key battery
- Slide the release catch and pull out the emergency key blade.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot the blade leaves and twist gently to part the case. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new CR2032 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
Mk2
2004–2010- Flip remoteCR2032
- TransponderNo battery
A key with no buttons has no battery. It starts the car using a chip that needs no power.
Mk1
1998–2004- TransponderNo battery
A key with no buttons has no battery. It starts the car using a chip that needs no power.
- Remote head keyCR2032
North American models
Mk3 / Mk3.5 (C1/C1MCA)
2012–2018- Fixed remoteNot confirmed
We haven't confirmed this one. Open the key and read the code on the old cell, then buy the same.
- Smart keyNot confirmed
We haven't confirmed this one. Open the key and read the code on the old cell, then buy the same.
North American 2nd generation
2008–2011- TransponderNo battery
A key with no buttons has no battery. It starts the car using a chip that needs no power.
- Remote head keyCR2032
For locksmiths · Mk4
- KeysSmart key · Flip remote
- Tools confirmed13
- Transponder chipSubscribers
- Programming procedureSubscribers
Questions
Ford Focus key battery questions
Mk4 (2018–2024): CR2032 in the smart key and flip remote. Mk3 / Mk3.5 (2011–2018): CR2032 in the flip remote and smart key. Mk2 (2004–2010): CR2032 in the flip remote. Mk1 (1998–2004): CR2032 in the remote head key.