Comio S1 does have a very decent battery back up. It has 2700 mAh Li-Polymer non-removable battery which offers almost 15 hours of talk time and up to 143 hours of stand by period.
No. Comio S1 does not have the removable battery.
Yes, Comio S1 does have the fingerprint sensor.
Comio S1 is equipped with latest Android 7.0 Nougat.