It seems every new iPhone comes with some kind of controversey, and this time it's related to the companies that produced the processors for the new iPhone 6s and 6s Plus. Samsung makes many of them, but Taiwan Semiconductor makes more, which is a good thing because people testing this device have found that the chips from Taiwan Semiconductor are more power efficient. Apple's official statement on this matter says: With the Apple-designed A9 chip in your iPhone 6s or iPhone 6s Plus, you are getting the most advanced smartphone chip in the world. Every chip we ship meets Apple's highest standards for providing incredible performance and deliver great battery life, regardless of iPhone 6s capacity, color, or model. Certain manufactured lab tests which run the processors with a continuous heavy workload until the battery depletes are not representative of real-world usage, since they spend an unrealistic amount of time at the highest CPU performance state. It's a misleading way to measure real-world battery life. Our testing and customer data show the actual battery life of the iPhone 6s and iPhone 6s Plus, even taking into account variable component differences, vary within just 2-3% of each other. It's possible for both the people benchmarking A9 chips and Apple to be correct because each is talking about different circumstances. When running highly-demanding software, like benchmarks but also high end games, the Taiwan Semiconductor version is going to get better battery life. In other situations, like web or email, the difference will be small, as Apple points out. Unfortunately, there's no simple way to determine which company produced the A9 processor in any given iPhone 6s or 6s Plus.