No. Tecno i3 do not have Gyroscope sensor.
Tecno i3 standard box package includes Mobile Phone (with battery), USB Power Adapter, USB Cable, Free Screen Guard, Free Back Cover, Earphone, User Manual, Sim Ejector Pin and Warranty card.
Yes, Tecno i3 comes with hybrid sim slot.
No. Tecno i3 comes with in-built battery.