My God-daughter and I were stranded one evening. I called my cousin for help and if she could pick up a portable jump charger and my Mighty Jump to try out at my house. When she arrived, I read the directions and thought, who has 15 minutes to wait after waiting already. So I decided to connect the portable jump charger and turned the key. Nothing. I rechecked and notice no voltage on voltmeter of the portable jump charger. I guess I do have 15 minutes to wait after all. Plan B into action and waited, 5 minutes, then 10 minutes, I decided to check how much voltage was going through rehooked up portable jump charger and 10 volts were showing and kept going up. Amazingly it reached peak at about 12.7 after the said 15 minutes. Viola, car started up right away. A few days later. My husband called me the same car. Didn't start. I told him his portable jump charger was in the car. Let me tell you, Mighty Jump not only helped me, it charged his portable jump charger at the same time, and he used that a few days after!
Best friend for emergencies. I make sure Mighty Jump travels with me!
Bottom Line: Yes, I would recommend this to a friend