I picked up the iTorch as a 'just in case' gadget. I am glad I did. The family went camping this weekend and we were out in the middle of no where in a tent. We had cell coverage, but no way to charge iPhones without going back to the car. The IMP52D came worked out perfectly. It was able to recharge an iPhone 4 twice and a Kindle Fire with 1 charge. I cant be totally exact on how long the charges kept because the kids kept plugging their devices into the iTorch, then taking them off 30 minutes later.