We travel a lot, so I purchased 2 battery packs and use them frequently. I can charge my device, my bluetooth headset, earbuds, ereader and tablet. That's a lot of juice required. I also learned that if I don't have my battery pack with me, I can charge my friends phone from my BlackBerry Keyone with a usb cable and adapters to mini or C or micro. I never thought I would use the batteries, but now they have become a necessity. I can even charge my camera and BT speaker. yay
