Replace the Key Fob Battery

Reviewed by the Service Reset editor · Updated August 22, 2026 · How we verify
Quick referenceToolsNew CR2032 cell + flat screwdriverTime~5 minMethodReplace CR2032 coin cell — programming retained

These instructions apply to the Mini Cooper Mk3 (F55/F56) 2013-2024.
For other models, please choose your vehicle here.

A Mini Cooper F56 (and F55 five-door, 2013–2024) remote that has lost its range or gone unresponsive almost always just needs a new coin cell. The Mini fob hides a mechanical key and the battery behind it, so the swap is quick once you know the order. Here is the full job, plus why a replacement key has to come from Mini.

Mini Cooper Mk3 — the vehicle covered in this guide.
Mini Cooper Mk3. Photo by Dinkun Chen via Wikimedia Commons, licensed CC BY-SA 4.0.

Battery First

The F55/F56 fob uses a CR2032 coin cell, fitted positive (+) side facing up. A weak cell is behind nearly every “Mini remote not working” complaint, so fit a fresh one before suspecting the car. The fob holds a pull-out mechanical key that opens the driver’s door if the remote is dead.

Replacing the Fob Battery

  1. Press the button and pull out the mechanical key from the fob.
  2. Remove the key cover, then remove the button-cell cover underneath.
  3. Lift out the old cell and fit a new CR2032 with the positive (+) side facing up.
  4. Reassemble in the reverse order (cell cover, key cover, mechanical key).
  5. Test that the remote locks and unlocks.

Lost Key or Adding a Spare

A battery swap retains the existing coding. If a key is lost or broken, a replacement can only be ordered from a Mini dealer, and programming a new fob requires a diagnostic tool through the car’s security system — there is no owner sequence.

If a Fresh Cell Doesn’t Help

  • Check the cell is positive-up and seated fully — the usual reason a swap doesn’t take.
  • Hold the fob against the start button to start the car if the remote won’t respond (the Mini reads it directly).
  • Still dead? A receiver or footwell-module fault may store a code — look it up on autodtcs.com.

Frequently Asked Questions

What battery does the Mini F56 key fob use?

A CR2032 coin cell, fitted positive-side up.

Do I need to reprogram the fob after the swap?

No — the coding is retained for a battery change.

Can I buy and program a new Mini key myself?

No — a replacement key must be ordered from Mini and coded with a diagnostic tool.

Does this apply to the 5-door F55 and Convertible F57?

Yes — the F55, F56 and F57 share the same fob and CR2032 cell.

If the remote stopped responding after a battery disconnection, see our Mini F56 battery disconnect/reconnect guide.

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

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