Let's cut into Apple's bullshit. LiOn ageing is not unique to Apple. The problem is that their batteries are so horribly low powered (1800 mAh for iPhone 6s), especially for the price of the overall phone, that normal known ageing patterns would render the battery below spec of max power the iPhone draws at peak performance. It's BAD design. Note 8 ships with 3300mah and iPhone X with 2700mah. Both cost a $1000. Which one do you think will last longer if 2500mah were the max power threshold?