A:Answer Your ear buds will last as long you use them once they’re fully charged. If you have them in your ear un-used, to save the battery strength, the ear buds will go into deactivation mode, until you’re ready to use them again like taking an incoming call, or play Spotify. To reactivate, press the buttons on the top of the right side ear bud, and hold down for about three seconds, then release. A voice will speak alerting you that the ear buds are reactivated.