I was so excited to try these because my kids keep destroying charging ports on their phones. But they don't even charge. While it kept my phone at the same 55% charge level (which I started with) for the last hour, it didn't even charge, and that was with the phone off to see if that helped. When I tried to charge my phone with this charger, it couldn't even hold the same percentage. I think it shouldn't lose charge when plugged in and it should charge when my phone is off! Very disappointed. Update The phone was charged 10% in 2 hours when it was off.