Replace the Key Fob Battery

Last updated: June 12, 2026

If the key fob on your Infiniti Q70 (Y51, 2014–2019) has gone weak or the central locking has become intermittent, the coin cell inside is almost certainly flat. It’s a quick swap with a CR2032.

Battery First — What You Need

• A CR2032 coin cell.
• The fob’s own mechanical key blade and a small screwdriver.

Replacing the Cell

1. Pull out the mechanical key from the fob.
2. Insert a screwdriver in the slot and remove the button-cell cover.
3. Remove the old cell.
4. Fit a new CR2032, observing the correct polarity.
5. Refit the cover and the key, then check the remote locks and unlocks the car.

Lost Key or Adding a Spare

A cell swap keeps the existing coding. A lost or broken key can only be ordered and programmed by a dealer with a diagnostic tool — there’s no owner sequence.

If a Fresh Cell Doesn’t Help

• Check the polarity — an upside-down cell won’t work.
• Use the mechanical blade to unlock the door in the meantime.
• Still intermittent? A receiver fault can store a code — look it up on autodtcs.com.

Frequently Asked Questions

What battery does the Infiniti Q70 key use?

A single CR2032 coin cell.

Do I need to reprogram the key after the swap?

No — the coding is retained for a battery change.

Can I program a new Q70 key myself?

No — a replacement must be ordered and coded by a dealer.

How do I open the fob?

Remove the mechanical key, then prise off the cell cover with a small screwdriver.

If the fob stopped working after a battery issue, decode any stored code on autodtcs.com.