https://www.theregister.co.uk/2018/09/21/ifixit_iphone/

The screwdriver fiddlers at iFixit have inflicted their usual brand of affection upon Apple’s pricey new phones and found a battery of a most unusual shape.

Having taken a few short seconds to admire the oh-so-shiny Gorilla Glass cover of the XS and XS Max, the iFixit engineers went at the unfortunate devices with an array of openers, suction pads and spudgers to prise the things apart.