These instructions apply to the Renault Arkana Mk1 (XJL) 2021-Present.
For other models, please choose your vehicle here.
The Renault Arkana (2021–present) doesn’t use a conventional key fob at all — it ships with Renault’s flat “hands-free” card (the keycard), the same credit-card-shaped remote you’ll find in the Clio, Captur and Mégane of the same era. When that card only locks the car from arm’s length, stops opening the doors as you walk up, or throws a battery warning on the dash, the cause is almost always the single coin cell hidden inside it. Here is how to tell a flat card from a genuine fault, the exact battery the Arkana’s card takes, how to open the case without cracking it, and why cutting a brand-new card is a job you can’t finish on the driveway.
How to Tell the Card Battery Is Dying
- Hands-free stops working. The doors no longer unlock automatically as you approach or when you touch the handle — the first and most common sign the card’s cell is fading.
- Shrinking button range. You have to stand right next to the Arkana, or hold the card against the door, for a press to register.
- “Keycard battery low” on the dash. The Arkana displays a low-keycard-battery message in the instrument panel when the cell is weak — a clear prompt to change it before the card stops entirely.
- Intermittent response in the cold. A near-flat lithium cell struggles at low temperature, so the card may work one morning and not the next.
The card’s battery typically lasts around two years in normal use. If yours is around that age and showing any of the above, fit a fresh cell before suspecting the car’s receiver or immobiliser.
The Battery You Need
The Arkana’s hands-free card uses a single CR2032 — the standard 3-volt lithium coin cell, sold in any supermarket, hardware shop or petrol station. It’s the same cell across Renault’s current flat-card range, so it’s easy to find. Buy a good-quality branded cell: cheap coins sag under the brief high current the card’s transmitter draws and can give short range even when “new”. You’ll only need one, plus a fine flat tool to ease the case apart.
How to Change the Renault Arkana Card Battery
- Free the emergency blade first. The Arkana’s card carries a small integrated metal key for the driver’s door. Release its catch and slide the blade out of the card — it’s in the way of the rear cover and you don’t want to snap it.
- Slide the rear casing off. Hold the card face-down, press gently on the marked release area (Renault labels it “zone A” in the manual) and slide the back cover downwards. It moves as one piece — don’t try to prise it straight up.
- Lift out the old cell. With the cover off you’ll see the CR2032 in its holder. Press down on one edge of the cell and lift the opposite side out. Handle it by the rim — keep your fingers off the flat green circuit board and the metal contacts.
- Fit the new CR2032 the way the card shows. There is a small polarity template moulded into the holder or the inside of the cover; seat the new cell to match it, which is the same way up as the one you removed. Make sure it clicks fully under its clip.
- Refit the cover and blade. Slide the rear casing back on until it latches, then push the emergency key blade home until it clicks.
⚠️ Get the orientation right. A coin cell fitted upside down won’t power the card and can slowly discharge against the contacts — always copy the orientation of the cell you took out and follow the template inside the card. Renault also warns not to fit a cell with any dye or coating on its faces, as that can spoil the electrical contact.
Reactivate the Card and Check It Worked
After a battery change the Arkana’s card usually needs a moment to be recognised again. Stand next to the car and press one of the card’s buttons about four times, then start the vehicle: the “keycard battery low” message clears once the car reads the refreshed card. Now step back a few metres and confirm the hands-free unlocking and the lock/unlock buttons all work at full range.
If a Fresh Cell Doesn’t Fix It
- Re-check the orientation and seating. A cell fitted the wrong way up, or not fully clipped in, is the single most common reason a “new” card still fails. Reopen and compare against the template.
- Clean the contacts. A smear of finger grease or light corrosion on the terminals is enough to cause dropouts — wipe them with a dry cloth and reseat the cell.
- Try the door and start manually. Use the emergency blade to unlock the driver’s door, then hold the card against the marked spot on the steering column or start button to start the car — the Arkana is designed to still start with a flat card this way.
- Message still showing? It can take a drive cycle or two to clear. If the card is old or has been dropped, its transmitter may have failed, which is rare compared with a simple flat cell.
New Card or Spare — Why It’s a Dealer Job
Swapping the coin cell keeps the card’s existing coding, so nothing needs reprogramming and the card works straight away. A new or spare card is a different matter: a blank Renault card has to be ordered against the car’s VIN, the emergency blade cut to match, and the card synced to the Arkana’s immobiliser with diagnostic equipment. That makes adding a spare or replacing a lost card a job for a Renault dealer or an auto-locksmith — so it pays to keep your second card’s battery fresh too, and never be down to a single working card.
Frequently Asked Questions
What battery does a Renault Arkana keycard take?
A single CR2032 3-volt lithium coin cell — the standard flat cell used across Renault’s current hands-free cards, available almost anywhere.
Does the Arkana have a normal key fob or a card?
A card. The Arkana ships with Renault’s flat hands-free keycard, which has the lock and unlock buttons on its face and a slim emergency metal blade tucked inside for the driver’s door.
How do I open the Arkana card to reach the battery?
Slide the emergency blade out first, then press the marked release area on the back and slide the rear casing downwards. The CR2032 sits in a holder underneath — lift it out by the rim without touching the circuit board.
Do I need to reprogram the card after changing the battery?
No. A battery swap doesn’t affect the coding. Just press a card button a few times near the car; the low-battery message clears the next time you start it.
How long should the Arkana card battery last?
About two years in typical use. Leaving the card sitting close to the car, so the hands-free system keeps waking it, can shorten that noticeably.
Can I still drive the Arkana if the card is completely dead?
Yes. Use the emergency blade to unlock the driver’s door, then hold the card against the marked reader spot in the cabin and press start — the car is designed to start with a flat card, so a dead cell won’t strand you.
If the card stopped responding suddenly right after the 12 V battery was disconnected — rather than fading over weeks — the pairing, not the cell, is the more likely culprit; check any stored fault code on autodtcs.com.
Independent guide — not affiliated with Renault. Always follow your official service manual and safety precautions. Read our full disclaimer.