Apple's entire business model depends on making you buy a new $500 (at least) phone every year or two. Oh, my phone's slowing down, must be time for a new one, right? They basically need people to be dumb and helpless. If average iPhone user could replace their own battery Apple would probably sell 30% fewer new phones. That's what frustrates me about that company. They're not only insidious, they cynically target their own end users.
Contrast: I have a Yamaha stereo receiver built in I believe 1991. Top of the line then, still better than most anything you can buy now under $3000 at least. The LCD display went out. I called their customer service line, expecting bupkus. But they not only located the part, they mailed it to me FOR FREE, along with a schematic and the instructions for replacing it. That's a company that gives a **** about its products and its customers.