The Quick-Release Battery Pack allows you to have backup power for select battery powered Ring Doorbells and Cameras. To charge your battery pack, simply connect it to a micro-USB cord and plug it into a power outlet. If the battery pack in compatible Ring Video Doorbell or Security Cam runs out of power, you can remove your batteries by pressing the quick-release tab on the battery pack. Then, simply slide your second battery pack into your device, and you're good to go. Simply connect your battery pack to a micro-USB cord, and plug it into a power outlet to begin charging. When the battery pack in your Ring Video Doorbell 2, Spotlight Cam Battery or Stick Up Cam Battery runs out of power, you can easily remove your batteries by pressing the quick-release tab on the battery pack. Then you can slide your second battery pack into your device, and you're good to go.