LG Q6 comes with a non-removable 3000 mAh Li-Polymer battery.
Yes, LG Q6 does have a Gyroscope sensor.
LG Q6 is a metal frame phone. It is made of US Military Standard-810G Certified Aluminimum frame and on top, it has Corning Gorilla Glass 3 protection.
Yes, LG Q6 does have the NFC support.