That's odd: Apple is using two accelerometers with the new iPhones

After digging further, the folks behind Chipworks concluded that Cupertino likely had battery savings on their mind with the implementation: the Bosch sensor is a 3-axis accelerometer and draws less power than the 6-axis InvenSense accelerometer. That latter one is far more precise, but generally draws far more power, and so it's only turned on when sensitivity is of importance -- like when you're gaming. If you're simply looking to change the interface orientation from portrait to landscape, however, the Bosch chip is the one that the new iPhones are likely making use of, not least because it also has a lower start-up time.
In all, while this likely helps the new iPhones conserve some energy, our battery benchmark indicates that you can only optimize a battery so much -- after a certain point, you just need more capacity.
source: Chipworks
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