No. Comio S1 does not have the removable battery.
Comio S1 dimensions are 149.2 x 72.6 x 7.9 mm.
The standard packaging of Comio S1 includes - Mobile phone (with battery), USB Cable, USB Power Adapter, Ear Phone, User Manual, Warranty Card, Sim Ejector Tool, Screen Protection Film & a Free Back Cover.
Yes, Comio S1 does have support for Jio VoLTE also. You will be able to use Airtel VoLTE as well.