Replace the Key Fob Battery

Last updated: June 6, 2026

When your Ford EcoSport (B515, 2014–2022) only locks from close up, the key battery is flat. The EcoSport came with two key styles — a fold-out (flip) remote and, on higher trims, a keyless smart key — and they take different cells.

Which Cell You Need

• Flip / blade remote: a CR2032 coin cell.
• Keyless smart key (keyless entry): a CR2450 coin cell.

Check which key you have before buying the cell.

Flip Remote

1. Flick out the metal blade and use the gap to split the case.
2. Swap the CR2032, matching polarity, and clip it shut.

Smart Key

1. Slide the catch and remove the emergency blade.
2. Prise the case open at the seam.
3. Replace the CR2450 the same way up and click it back together.

After the Swap

Lock and unlock once to confirm. A battery change keeps the existing pairing — no reprogramming needed.

Frequently Asked Questions

What battery does a Ford EcoSport key take?

The flip remote uses a CR2032; the keyless smart key uses a CR2450.

How do I tell which key I have?

If it folds out a blade at a button press it’s the flip remote (CR2032); the keyless fob with a pull-out emergency blade uses a CR2450.

Do I need to reprogram it?

No — the key keeps its pairing through a battery change.

Smart key still won’t start the car?

Hold it against the marked spot on the column/start button to start on the transponder, then have it checked.

If the car won’t wake at all, the 12 V battery may be flat — see our EcoSport battery guide. For a stored code, look it up on autodtcs.com.