Not all smartphones are capable of long-lasting battery life, and in these situations it's good to have a battery pack on hand. In addition it can also be a good idea to have one even if your phone can typically go a whole day or more without a charge if you plan to be away from outlets for a few days. While there are tons of battery packs out there to choose from, not all of them are of the same quality, which makes the deal on this Lumsing battery pack all the better. It comes with 10400mAh of power to charge your device at least a few times, and features two USB charging ports so you can charge two devices at once if you need to. There is also a set of LED indicator lights on the side so you know just how much battery power is left, and when the pack runs out of power you can charge it up using the microUSB port on the side.