Ortel 10400 mAh Power Bank (PQ2X009, Powerful )(Gold, Lithium-ion)

There are very few smartphones whose battery lasts for an entire day. It's also cumbersome to carry a charger, as you may not always find a power socket. Don't fret, as the Ortel Power bank gives you that extra juice so you can finish compiling your documents or beating your high score on Angry Birds.