The Power Max P18K Pop is, according to official specifications, 18mm or 7/10ths of an inch thick, storing a battery that . This is, of course, extreme almost to the point of parody, especially when you consider that the phone's absurd physical dimensions will likely make it impossible to fit into plenty of reasonably-sized pockets.
But! Despite the impracticality of this particular phone, in that it's both physically absurd and offers battery life so extreme as to be practically useless in any normal usecase, it is at least exploring under explored territory in the world of phones, specifically one of the two areas in which phones have so far mostly failed to improve even as top-tier phones trudge on and get more expensive.
The Power Max P18K Pop is unlikely to be a blockbuster, but at least it plays with the idea that phones should last longer, and have a different shape in a way that's actually practically useful and meaningful, instead of as a flashy gimmick that attempts to reverse-engineer uses for its tricks. The Pop is coming out in June for a price of 600 Euros, or around $680. And no, you might not want to buy one, but you should be glad it exists.