No. Gionee X1s does not have the hybrid sim slot. It has 2 dedicated sim card slots and 1 dedicated MicroSD card slot. You can use MicroSD card of up to 256GB with this phone.
Yes, Gionee X1s does have the VoLTE support.
Gionee X1s has 4000 mAh Li-Polymer battery. It offers 34 hours of talk time and standby time of 190 hours.
No. Gionee X1s does not have the NFC support.