What battery does a 2016-2021 Honda Civic key fob take?

It depends on which key you have. the Flip / basic remote (FCC MLBHLIK6-1TA, e.g. LX trim) takes a CR1620, and the Smart Key — push-button start (FCC KR5V2X, EX/Touring trim) takes a CR2032. We confirmed each against two independent sources. Pop your fob open and read the marking on the old cell to be sure which one you have.

How do I change the key fob battery on a Civic?

Find the small seam or slot on the fob (often near the keyring loop) and gently pry the two halves apart with a coin or a small flathead. Note which way the old CR1620 / CR2032 sits, pop it out, and drop the new one in the same orientation (usually positive side up). Snap the fob back together. If the buttons feel unresponsive after, re-seat the cell.

2016-2021 Honda Civic key fob battery

The coin cell your Civic key fob takes, confirmed against two independent sources. Your car uses a different cell in the smart key than the basic remote — each is listed below. The marking on your old battery is the final confirmation.

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Key fob battery

Verified · 2 sources · Jun 2026

Flip remote

Flip / basic remote (FCC MLBHLIK6-1TA, e.g. LX trim)

CR1620Find on Amazon

Smart key

Smart Key — push-button start (FCC KR5V2X, EX/Touring trim)

CR2032Find on Amazon

Cross-checked against two independent sources. Pop open your fob and check the marking on the old cell before you buy — it's the final word, and it confirms which fob style yours is.

Civic key fob battery questions

What battery does a 2016-2021 Honda Civic key fob take?: It depends on which key you have. the Flip / basic remote (FCC MLBHLIK6-1TA, e.g. LX trim) takes a CR1620, and the Smart Key — push-button start (FCC KR5V2X, EX/Touring trim) takes a CR2032. We confirmed each against two independent sources. Pop your fob open and read the marking on the old cell to be sure which one you have.
How do I change the key fob battery on a Civic?: Find the small seam or slot on the fob (often near the keyring loop) and gently pry the two halves apart with a coin or a small flathead. Note which way the old CR1620 / CR2032 sits, pop it out, and drop the new one in the same orientation (usually positive side up). Snap the fob back together. If the buttons feel unresponsive after, re-seat the cell.