A CR1616 is the small coin cell in many older Honda remotes. It is about 16 millimeters across and 1.6 millimeters thick, and it is 3 volts.

A CR2032 is the coin cell inside most Honda smart key fobs. It is a 3-volt lithium cell, 20 millimeters across and 3.2 millimeters thick.

This chart is the shopping list. It is not a substitute for the stamp on the cell in your fob.

The battery a Honda key fob takes is printed on the battery already inside it.

How to replace a Honda key fob battery is a five-minute job if you open the shell the way it was designed to open.