about 2 hoursOnce installed, the app or web interface will tell you the % charge of each camera. When they do need charging, charge time is about 2 hours depending on how flat they are. When you plug the charger in, the blue led will flash quickly and then go off. It will then come back on solid when the battery is fully charged.
How do I know when my Arlo battery is charged?
A regular 5V USB cable cannot provide enough power to charge your camera’s battery properly. Reinsert the camera battery. After ten minutes, check your camera’s status in the Arlo app or at my.arlo.com. If you see a lightning bolt battery icon, your battery is charging.