These instructions apply to the Hyundai i30 Mk1 (FD) 2007-2012.
For other models, please choose your vehicle here.
If the remote on your Hyundai i30 Mk1 (FD, 2007–2012) only locks the car from up close, needs a second or third press, or has stopped working, the cause is almost always the coin cell inside the key — not the car. The i30 FD uses a folding flip key with the remote buttons built into the top, and swapping its battery is a two-minute job with just a small screwdriver.
How to Tell the Key Battery Is Weak
- Shrinking range. You have to stand close to the car for it to respond, where it used to work from across the car park.
- Second- or third-press. The buttons work only intermittently, and it is worse in cold weather.
- No response at all. A fully flat cell means nothing happens — but the fold-out metal blade still unlocks the driver’s door.
A coin cell in a flip key like this typically lasts three to four years. If yours is older and doing any of the above, fit a fresh battery before suspecting the car.
The Battery You Need
The i30 FD flip key uses a single 3 V lithium coin cell — usually a CR2032. To be sure, open the key and read the code stamped on the cell you take out and match it exactly. Buy a good-quality branded cell; cheap coin cells can read as flat almost from new.
How to Change the Battery
- Fold out the metal blade (press the release button so the key swings out) — this exposes the seam of the case.
- Split the case. Insert a small flat screwdriver (tape the tip) into the seam and gently twist to pop the two halves apart. Do not force it; the clips are light.
- Note which way up the cell sits, then lift out the old coin cell. Handle the new one by its edge — finger grease on the faces can cause poor contact.
- Fit the new cell the same way round and press it under its clip.
- Clip the case back together, fold the blade back in, and test lock/unlock from a normal distance.
Does It Need Reprogramming?
No. Replacing the coin cell does not affect the key’s pairing with the car, so it works the moment you reassemble it. Reprogramming is only needed for a brand-new or replacement key, which a Hyundai dealer or an auto-locksmith codes to your car.
If a Fresh Cell Doesn’t Fix It
- Re-check the cell is the right way up and clipped down firmly — an upside-down or loose cell is the most common reason a “new” battery changes nothing.
- Wipe the contacts inside the key with a dry cloth to remove grease or corrosion.
- Confirm you fitted the correct cell (usually CR2032) — a thinner cell can sit loosely and give poor range.
- If it still will not work, the key’s electronics may have failed and need replacing, which is rare next to a simple flat cell.
Frequently Asked Questions
What battery does the Hyundai i30 FD key take?
A single 3 V lithium coin cell, usually a CR2032. Read the code on the old one and match it exactly.
Do I need any tools?
Just a small flat-blade screwdriver to split the case. No programming equipment is needed for a battery swap.
Do I have to reprogram the key afterwards?
No. A battery change does not touch the coding, so the remote works as soon as you reassemble it. Only a new key needs coding to the car.
Can I still get into the car if the remote is dead?
Yes. The fold-out metal blade unlocks the driver’s door and the car starts normally — the flat coin cell only affects the remote locking, not the immobiliser.
My key still won’t work with a new battery — is the car broken?
Usually not. Re-check the cell orientation, seating and code, and clean the contacts. If it is still dead the key’s electronics are likely at fault, which a locksmith can renew — the car itself is almost certainly fine.
If the remote stopped working suddenly — for example right after the 12 V battery was disconnected — rather than fading gradually, it is worth reading any stored code. You can look one up on autodtcs.com.
Independent guide — not affiliated with Hyundai. Always follow your official service manual and safety precautions. Read our full disclaimer.