I tried out the Anker Nano and haven't used my Apple wall charger since
Source: Anker Most of today's electronics and toys are portable. That's a good thing, except for the part where they all require frequent charging to stay in working order. I love having wireless devices at my disposal for every imaginable task, but I'm less thrilled with waiting for them to juice up every day. My iPhone is a crucial piece of my toolbox, and I'm betting you can say the same for your phone. It keeps me connected to my work and family when I'm on the road or at home, and I count on it more than any other device I own. Still, keeping the battery in the green is a chore.
Source: imore.com