I bought the iTorch to charge my iPhone while on the Appalachian Trail. I tested it 6+ times to ensure the weight was worth carrying since weight is a premium when you are carrying everything on your back. I have gotten 2+ charges to 95-100% so well worth the weight since it can be a 5-10 days between places to charge on AT. The unit is easy to use, the blue lights keep you informed of the charge available and the red LED light is an added bonus.  I am very pleased with the quality!  I did contact New Trent with a question and they were very quick to respond and were most helpful.  If you need a lightweight battery charge, the iTorch is an excellent choice.