Wow I drove 2 hours to circle the lake and then kayaked. The bottom deck of the kayak picks up 6 pounds after 20 minutes of battery use. It never had 1lb of air in it so I hitched it to a carport. takes 3lbs. After 30 minutes we had a glimmer of hope we were going to get some and after another 15 minutes we still hadn't reached 1lb of air, for a 2 motor supercharged it's terrible so we returned the kayak. truck and drove away very upset claiming that this is a great device. They send it back on Monday, glad I didn't half-deflate my truck tire.