More Performance & Battery Life The new custom-designed Apple A10 Fusion chip features a new architecture that powers these innovations, making it the most powerful chip ever in a smartphone, while also getting more time between charges with the longest battery life ever in an iPhone. The A10 Fusion’s CPU now has four cores, seamlessly integrating two high-performance cores that run up to two times faster than iPhone 6, and two high-efficiency cores that are capable of running at just one-fifth the power of the high-performance cores.