Yes, Gionee A1 Lite does support OTG.
No. During our review did not find any major heating issue. However, since the mobile phone is made of Alluminimum Alloy body and has got huge 4000 mAh battery - you may notice some heating issue while charging.
No. Gionee A1 Lite does not have removable battery.
Yes, Gionee A1 Lite has 2 dedicated sim card slots and 1 dedicated memory card slot. So, you can use all of them at one go.