CH_ASUSThanksaalot for such quick response m always in love with this new support on this new forum by u mods especially u @CH_ASUS thank u sir ?
1) Check your instagram version, make sure they are updated. There have been many cases of battery drain with FB related applications.
2) And yes, video calls will drain battery (as camera does use a lot of battery) - however I cannot say 19% is reasonable or not.
3) Please also try to clear your instagram settings and re-login + restart your device.
Ping us if you get further issues in future instagram calls, thank you