Canon EOS RP Mirrorless Camera - Manual (Page 560)

560
Using an Extension Grip
Extension Grip EG-E1 (sold separately) is a dedicated accessory that
makes EOS RP cameras even easier to hold. The battery and card can be
inserted or removed while the extension grip is attached to the camera.
1
Remove the card slot/battery
compartment cover.
z Turn the camera off and remove the
cover. Be careful not to lose the cover
after removal.
2
Attach the extension grip.
z Attach as shown at left and turn the
attach/detach dial to lock in place.