I understood your comment. The article implies that the battery has to be _easily_ replaceable, i.e. that you could just take a battery and maybe a screwdriver

I understood your comment. The article implies that the battery has to be _easily_ replaceable, i.e. that you could just take a battery and maybe a screwdriver out of your pocket and replace it. I don't think it's easy to design a phone that would at the same time a) have easily replaceable battery, and b) be waterproof until the first battery replacement.