These instructions apply to the Hyundai i10 Mk3 (AC3) 2020-Present. For other models, please choose your vehicle here.
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If the remote on your Hyundai i10 Mk3 (AC3, 2020–present) has gone weak — short range, fussy keyless entry, or a “key battery low” message — the coin cell needs renewing. The i10 key uses a CR2032 and opens with the emergency blade (on keyless versions). No programming required.
What You’ll Need
- A fresh CR2032 3 V lithium coin cell.
- The fob’s mechanical key (keyless versions), plus a small flat screwdriver.
How to Replace the i10 Mk3 Key Battery
- Pull out the mechanical key blade (smart key) or find the seam on the standard remote.
- Use a small screwdriver to prise the case open / remove the cover.
- Lift out the old CR2032, noting it sits positive side up.
- Fit the new cell the same way, by the edges.
- Click the case together and refit the blade.
- Test lock/unlock from a normal distance.
Does It Need Programming?
No — the swap doesn’t affect the key’s pairing, so it works straight away. A lost or extra key can only be ordered and coded by a Hyundai dealer.
If It Still Won’t Respond
Re-open the fob, check the cell sits positive-up with clean contacts. On keyless cars, hold the smart key against the start button to start if entry is slow.
Frequently Asked Questions
What battery does the i10 Mk3 key take?
A single CR2032 3 V lithium coin cell.
Will the car start with a flat key battery?
On keyless cars, hold the smart key against the start button to start; the mechanical blade unlocks the driver’s door. On a standard key, it works in the ignition as normal.
Which way up does the cell go?
Positive (+) side up, matching the cell you removed.
Can I program a spare key myself?
No — Hyundai key coding needs the dealer system. Only the battery swap is DIY.
To clear a service reminder after maintenance, see our i10 Mk3 service reset guide. For warning lights, look up the code on autodtcs.com.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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