The batteries and a QR code representing the Device Serial Number (DSN), are found inside the case of your Blink doorbell. The Blink Video Doorbell uses two, size AA Lithium non-rechargeable batteries.
To change batteries, follow the instructions to open the case. If you have a wired installation, disconnect power before removing the doorbell from its back plate. This is to protect you from possible electrical shock from the exposed terminals or wiring.
Opening the Blink Video Doorbell Case
To remove the doorbell from its back plate, use the Opening Key that came taped to the paper template in the product box. If you need another key, contact Blink support.
Put the key into the opening at the base of the Blink Video Doorbell.
If your doorbell has a battery cover, then removing it from the back plate is done by pressing the key straight into the slot until the grey catch is released.
If your doorbell has an open battery compartment, the latch is opened by pulling the key toward you slightly. When released, slide the doorbell up while pivoting away from the back plate.
Inside the battery case you can find the QR code and corresponding Device Serial Number (DSN), the reset button, and a diagram shows the correct position to insert new batteries.
There are two types of doorbell design. One has an open battery bay, the other has a weather protective battery cover. They are shown below.
Open battery bay
With Battery cover
Battery cover removed
For doorbells that have them, the battery cover provides weather resistance, which is important to the doorbell working properly. Keep the battery cover safe when changing batteries.
Open battery cover: Press the grey release button to open, then lift it to remove.
Replace battery cover: Insert tabs of the door into slots near terminal screws.
Close battery cover: Complete closing the door and press until a click confirms it is secure.
Reconnecting the doorbell
If your doorbell has a battery cover, make sure it is in place, and secured before reconnecting to the back plate. Align the top of the doorbell with the top of the back plate so that the hook sets, then press the bottom against the back plate firmly until you feel and hear a click.
For doorbell with an open battery bay, connect the doorbell to the back plate by lining up the pins and using a two step motion - press the doorbell against the back plate firmly (with moderate force), then push down to line up the bottom edges. You should feel a slight click when the doorbell is secure.
Press the doorbell button to test it.