No. Moto Z2 Play comes with nonremovable battery.
Moto Z2 Play comes with Water repellent nano-coating**. Advanced nano-coating technology creates a water repellent barrier to help protect against moderate exposure to water such as accidental spills, splashes or light rain. Not designed to be submersed in water, or exposed to pressurized water, or other liquids.
Yes, Moto Z2 Play comes with latest Android 7.1 Nougat OS and does support Screen Cast.
Yes, Moto Z2 Play does have VoLTE support, also.
Moto Z2 Play has protection against water. It comes with water repellent nano-coating.