My wife bought one to go with her Air Mini travel CPAP. She tested it out and the battery lasted 2 nights with 16% remaining after 2nd night. She then tested it on pass-through on the 3rd night (charging from house electricity while powering the Air Mini), and battery was fully charged by morning. Will probably purchase a 2nd one so that I can carry onto flights or in RV camper as even more backup, and to power laptop and charge phones. Excellent for times away from dependable power (RV, international travel, blackouts, etc).