An interesting option is the Moto Z line with one of its external power pack accessories (in particular the Moto Z Play, which of the Moto Z line is the heavies

An interesting option is the Moto Z line with one of its external power pack accessories (in particular the Moto Z Play, which of the Moto Z line is the heaviest and the one with the biggest internal battery). The internal battery is not changeable, but the external power pack feels a lot like a changeable battery. (Disclaimer: I have one, as do several of my friends and coworkers.)