I received the Viivant high capacity 15000mAh portable charger in exchange for my honest unbiased opinion. Its bigger and heavier than I was expecting. It charges my Motorola XT1080 about 3 or 4 times before it needs to be recharged itself. Its not as powerful as expected and my device is slower to charge with this than my 12500mAh portable charger. It also is just that a battery pack. No extras such as flash light like some others I have. It is just basic high capacity battery pack.