It used to be so simple: you grabbed your gadget, and you plugged it into the nearest available USB hole. Then, a few minutes or hours later, your device was fully charged.
Now we have retina iPads with laptop-sized batteries, 5W, 10W and 12W chargers, and even differently-rated USB ports in our Macs. It’s so confusing.
Let’s make this problem disappear by throwing some money at it. $49 worth of cash-money, to be precise. And that $49 will get you the… DoubleUp!