The A10 fusion chip is the smartest and most powerful chip ever used by a Smartphone. Let not the size fool you. It not just makes the iPhone work faster, but also ensures that the functions are well executed. The processing speed is higher than the previous iPhones and does not even require much power. The battery life is the longest that you have experienced in an iPhone, and you will require less of it every day as the phone has its own mechanism of preserving power