Open the Blink app and check the camera status
Remove the camera from its mount if needed
Open the battery compartment cover on the back or bottom of the camera
Remove the old batteries
Insert new AA lithium batteries, matching the polarity markings
Close the battery compartment cover
Reattach the camera to its mount if removed
Reopen the Blink app and confirm the camera is online
Test the camera to make sure it is working properly