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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.
Yes, Comio S1 does have a hybrid sim slot. You can either use 2 sim cards or 1 sim card & 1 MicroSD card.
No. Comio S1 does not have the removable battery.
Comio S1 has 2GB RAM.
Comio S1 has got 1.3 GHz MediaTek MT6737 chipset.
Good phone. No hanging problem.