Honda CR-V 2021 Owner's Manual page 610

uuRemote Transmitter CareuReplacing the Button Battery
■
Smart Entry Remote
Battery
* Not available on all models
608
*
Battery type: CR2032
1. Remove the built-in key.
2. Remove the upper half of the cover by
carefully prying on the edge with a coin.
u Wrap a coin with a cloth to prevent
scratching the remote transmitter.
u Remove carefully to avoid losing the
buttons.
3. Make sure to replace the battery with the
correct polarity.