How long will the Oxy-Angel last with fully charged batteries? lester Ng October 07, 2019 08:34 Updated Follow The Oxy-Angel lasts for about 30 hours in a fully charged battery. Related articles What is the Oxy-Angel’s effective range? Can I leave the Oxy-Angel turned on continuously? How can I tell if my Oxy-Angel is working well? Does the Oxy-Angel make noise when functioning? What are Negative Ions? Comments 0 comments Please sign in to leave a comment.