These instructions apply to the Renault Captur Mk2 (XJB) 2020-Present.
For other models, please choose your vehicle here.
A weak remote on your Renault Captur Mk2 (XJB, 2020–present) — short range, hesitant keyless entry, or a “key battery low” message — almost always means the coin cell is due for renewal rather than anything wrong with the car. The Captur came with either a flip key or a hands-free keycard, and the two take different cells, so identify which you have before you buy. If you have the hands-free card, bear in mind that a keyless key is always listening for the car and so drains its cell faster than a plain button remote. Either way, both swaps are quick, need no programming, and cost very little.
How to Tell the Fob Battery Is Dying
A coin cell fades gradually, so the symptoms creep in over a week or two:
- Shrinking range — you used to lock from across the car park; now the car only responds within a metre or two.
- A “key battery low” message on the dash, which the Captur shows when the signal weakens.
- Keyless entry only works up close on the hands-free card — walking up and touching the handle no longer wakes the car.
- Intermittent response that’s worse in the cold, because a tired lithium cell loses voltage further at low temperatures.
As a rough guide, a plain button flip key can go two to four years on a cell, whereas the always-listening keycard tends to want a fresh one nearer once a year. If your remote is a couple of years old and doing any of the above, the battery is the first thing to rule out.
Which Cell You Need
- Flip key (folding blade): usually a CR1620 (some use CR2016) — check the old cell.
- Hands-free keycard (pocket card): a CR2032.
All three are 3 V lithium coin cells, but they are not interchangeable — a CR1620 is much thinner than a CR2032, so a thinner cell won’t press against the contacts and a thicker one won’t fit the holder. Buy a branded cell, and whatever you have, match the number stamped on the cell you take out.
How to Replace the Cell
- Flip key: pop out the emergency blade, then prise or slide the case open at the seam with a small screwdriver. Keycard: slide the rear cover off (look for the small release notch along the edge).
- Note which way up the old cell sits, then lever it out with a small screwdriver.
- Fit the new cell the same way round, handling it by the edges so you don’t leave finger oils on the faces.
- Close the case (refit the blade on the flip key) until the seam clips shut, and test lock/unlock from a normal distance.
⚠ Polarity matters. A coin cell fitted upside-down won’t power the remote and can bridge the contacts in some holders. If you’re unsure, photograph the old cell before you remove it and copy its orientation exactly.
Confirm It Worked
Stand a few metres from the car and lock, then unlock, watching for the indicators to flash. On the keycard, walk up and try hands-free entry. If a “key battery low” message was showing, it clears on its own once the car reads a strong signal again; a short drive cycle guarantees the reset.
If a Fresh Cell Doesn’t Fix It
- Re-open the key or card and confirm the cell is the right way up and fully seated.
- Double-check the code — a CR1620/CR2016 for the flip key, a CR2032 for the card.
- Wipe the contacts with a dry cloth or cotton bud — a fingerprint or speck of corrosion is enough to cause weak range.
- With the keycard you can still start by holding it against the marked reader (or in the card slot where fitted) and pressing start.
- If everything checks out and it’s still weak, don’t overlook the car’s own 12 V battery — a flat vehicle battery can mimic key faults.
New Key or Spare — Why It’s a Dealer Job
Changing the coin cell never disturbs the remote’s coding, so it works the moment the fresh battery is in. A lost or extra key or card is different: it can only be ordered and coded to your car by a Renault dealer with diagnostic equipment. Keep the cell in your spare fresh too — a keycard left in a drawer for a couple of years is often flat exactly when you need it.
Frequently Asked Questions
What battery does the Captur Mk2 key use?
The flip key takes a CR1620 (some use CR2016); the hands-free keycard takes a CR2032. They aren’t interchangeable, so check the number on the old cell before you buy.
Which way up does the cell go?
The same way round as the one you removed — on both the flip key and the card. Photograph the old cell before lifting it out if you’re unsure of the orientation.
Do I need to re-pair the remote afterwards?
No. The battery swap doesn’t affect pairing, so the remote works at once — just refit and test. Re-pairing is only needed for a genuinely new key or card.
How long should a new cell last?
A plain flip key can run two to four years on a cell; the always-listening keycard tends to need one nearer once a year. If it fades much sooner, re-check the code and seating.
Can I program a spare myself?
No — Renault key and card coding needs the dealer system. Only the battery swap is a DIY job; ordering and coding a spare is not.
Will the car start with a flat remote?
Yes — the flip key works in the ignition, and the keycard starts the car when held against the marked reader (or placed in the card slot where fitted). The emergency blade in the flip key unlocks the door if central locking won’t respond.
To clear a service reminder after maintenance, see our Captur Mk2 service reset guide. For warning lights, look up the code on autodtcs.com.
Independent guide — not affiliated with Renault. Always follow your official service manual and safety precautions. Read our full disclaimer.