I had two of these fail on me in less than a year's time. The first one was also DOA out of the box, these were all ordered on Amazon. Both were under warranty at the time of failure but I neglected to send them in so now I have two dead one's collecting dust. I switched the the Anker Astro Pro2, it's a little bit of a pita to turn on since it has to sense demand but that is also good because it will power itself off once you turn off your gear. It's thinner, lighter & 20,000 mAh for about the same money, maybe a little less than the Naztech FYI.