How long does the battery last? Jenny Flor Jiang March 19, 2018 12:10 Updated Follow The battery lasts for approximately one month with a single charge if you brush your teeth twice a day. Related articles How long does it take to fully charge the empty battery? Can I leave the Amabrush constantly sitting on the charging station? Tell me more about the UV-station Can the battery be replaced if it is broken? How do I charge the Amabrush? Comments 0 comments Please sign in to leave a comment.