H1609444748759 , via OnePlus 8T Aquamarine Green , Jan 4, 2021 : I too bought OnePlus 8t on 31st December 2020. When I switched on, os updated immediately. After being used for 4 days. I found that battery get drained very fast. Charging happens very fast, the battery also drain very fast. 100% power goes to 30 % in 5 hours . I need help from any one . I will happy if I get reply from OnePlus customer care. My email id. [email deleted by the moderation team - please avoid sharing private info in a public forum] .