I work for an on-call computer service. I never know where I'll be going and what kind of power source will be available should I have to be there very long. I use both a smart phone and a pad in my work. I like the larger view that the pad gives me but mapping a trip and researching a problem can drain a battery quick, forcing me to rely on my smaller device to fill the gap when the bigger device runs low on battery. The IMP52D takes care of this problem in spades by removing the either/or option. From a single charge I was able to refresh the battery on my pad from 37% to full once, the battery on my smart phone from 26% to full once, and refreshed the battery on my stereo blue tooth head set 17 times (so far) and the IMP52D still has power left on the four LED charge indicator.