When you hardwire your Arlo Essential Video Doorbell Wire-Free to an 8-24V AC transformer, your doorbell still uses the battery to operate. The doorbell consumes battery while it is active, and it draws a small current through the wiring to gradually trickle charge the battery while it is asleep.
For safety and long-term reliability, the doorbell battery starts trickle charging when the battery level drops below 65 percent, then stops charging when it reaches 80 percent. The rate of charging and overall battery level is dependent on usage and weather conditions. Additionally, frequent use of the doorbell can result in complete battery drain because the doorbell battery only charges when not in use. You can use the Arlo app to verify changes in the battery percentage, but you will not see a charging icon when the doorbell is hardwired. To charge your battery to full, visit How do I charge my Arlo Essential Video Doorbell Wire-Free?.
For more information about hardwiring your Arlo Essential Video Doorbell Wire-Free, visit Can I hardwire my Arlo Essential Video Doorbell Wire-Free?.