After browsing through all kinds of portable battery chargers, I chose the New Trent iTorch battery charger. Not because it starts with an "i" but it looked attractive and ultra portable. It is a little heavy, but it was expected with a 5200 mAh battery. The day I received it, it came with more than 75% charge, which I used on a dead HTC one. After giving it a full charge, it was still not off, working like a hero! I like how the indicators show you how much charge is left on the device. Plus it comes with a USB cable which you can use to charge it and then to charge your phone. You can just put it in your pocket with your phone while charging it and you won't even know it's there! I don't really use the laser and flashlight on it but it's a must have while you're out camping or just when you need to use your phone without having to worry about a dead battery.