Replace the Key Fob Battery

Reviewed by the Service Reset editor · Updated August 31, 2026 · How we verify
Quick referenceToolsNew CR2032 cell + flat screwdriverTime~5 minMethodSplit fob case at the seam; swap CR2032; no reprogramming needed

These instructions apply to the Hyundai i20 Mk1 (PB) 2009-2014.
For other models, please choose your vehicle here.

If the remote on your Hyundai i20 Mk1 (PB, 2009–2014) has become weak — you have to stand close to lock or unlock, or it’s become unreliable — the fob’s coin cell needs replacing. The i20 key uses a CR2032 cell, and exactly how it sits depends on the key type. This guide covers both. It takes a couple of minutes with a small screwdriver.

Opened Hyundai i20 Mk1 (PB) remote key showing the CR2032 coin cell and removed back cover
The i20 remote opened up — lift out the old CR2032 and fit the replacement the same way round (here the positive + face is up). Photographed by Service Reset.

Replacing the Cell

Whether your i20 has the plip-style remote or the folding-blade key, it uses a single CR2032 3 V lithium coin cell, and it seats the same way. Hyundai’s own manual and this car agree — the positive (+) face points up.

  1. On the folding key, swing the metal blade out first. Insert a slim flat screwdriver into the case seam and gently prise the two halves apart to reach the cell.
  2. Note which way the old cell sits, then lift out the CR2032.
  3. Fit the new cell with the positive (+) symbol facing up, exactly as the old one sat.
  4. Clip the cases back together and check the remote locks and unlocks the car.

Does It Need Programming?

No — replacing the coin cell does not affect the fob’s pairing, so the key keeps working immediately. A lost or broken key can only be ordered and programmed by a dealer with a diagnostic tool — that part is not owner-doable.

Frequently Asked Questions

What battery does the i20 Mk1 key take?

A single CR2032 3 V lithium coin cell. Mind the orientation — on the flip key the cell sits positive (+) side up (as pictured); note how the old one came out and fit the new one the same way.

My remote still won’t work with a fresh cell — now what?

Re-open it and check the cell orientation and that the contacts are clean. If it’s still dead, the fob may have an internal fault and need replacing and programming by a dealer.

Can I program a spare key myself?

No — Hyundai key programming needs the dealer diagnostic tool. Only the battery swap is owner-doable.

Why does my key fold out a metal blade?

From 2010 the i20 used a flip key with an integrated blade for the door lock; earlier cars had a separate remote and key. Both just need a CR2032 swap.

For battery work, see our i20 battery disconnect/reconnect guide. For warning lights, look up the code on autodtcs.com.

Independent guide — not affiliated with Hyundai. Always follow your official service manual and safety precautions. Read our full disclaimer.

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