Don't know about this phone (we'll have to wait for the teardown), but iPhone batteries are pretty easily replaceable, and you don't need to go to an Apple Store to have them replaced. I run a chain of independent repair shops and we replace iPhone batteries all day long.

A press push for environmental reasons has made sure most smartphone batteries aren't glued in.

Now MacBooks and Surface Books, on the other hand, do tend to have glued-in batteries on newer models, so more pressure is needed there. We can still replace them, but they're a pain, and glue is not environmentally friendly at all.