As smartphones continue to get laden with more and more features, powerful processors and better screens, the biggest dilemma of today is ultimately battery life. Manufacturers try several techniques to work around this; some insert higher capacity batteries into their devices, or an ultra power saver mode. iPhone has its own take on the matter, and thanks to the tight integration between the hardware and the OS, even smaller capacity batteries on the device last better than what Android has to offer. However, there are still scenarios where you need to have an external solution, and that's where portable power banks come in handy.