Apple uses two manufacturers for its A9 processor chip found in the new iPhone 6s and iPhone 6s Plus. One version is made by Samsung using a 14nm process, and the other is a slightly bigger size built by TSMC. Tuns out that both versions have similar processor performance as expected, but the battery usage is different. Based on posts in Forums and Chinese sites, the iPhone that has TSMC processor can get up to two hours more battery life running Geekbench battery test, and is running cooler as well.
Apple is quick to respond in a statement to Techrunch to calm the uproar:
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.
Accordingly to Apple, you should not notice differences in real life usage. If you’re curious to find out the processor version in your new iPhone 6s or 6s Plus, download the free Lirum Device Info Lite from the App Store. Samsung chip with a supposedly lower battery life has the model number N71AP (iPhone 6s) and N66AP (iPhone 6s Plus). TSMC chip has the model number N71MAP (iPhone 6s) and N66MAP (iPhone 6s Plus). Really its best to get over this and just be happy that you’ll getting the newest and the best iPhone. You have no choice as you’ll know which version of iPhone only after opening the box.