Why do we need portable power source?
Well... the answer is that, the need of an accessible power source is vital for our daily survival. The average adult carries with him at least two electronic devices like smartphone, digital camera, MP3, laptop and tablet pc. And the truth is that we now depend on these devices to stay connected to the web, family and work. So what happens when your smartphone battery is dead? You will probably start to feel uncomfortable and pressure and if you didn't take your charger with you or in worst case you are staying outdoor with no accessible power port, you won't be able to use your smartphone.
The solution for this situation is to carry a power bank with you, it can recharge your electronic devices everywhere you go without the fear of going offline in the middle of a working day or even when you travel.