We are continually working on improving battery life. One thing that may help in the meantime is using Dark theme, which was a top mobile request added to Teams mobile in February.
Thanks!James Robson commented
4.6% background drain in 13 minutes on Galaxy Note 9 running Android P
We’re pleased to announce the Teams client for Linux is now available for preview. Please see details at https://techcommunity.microsoft.com/t5/Microsoft-Teams-Blog/Microsoft-Teams-is-now-available-on-Linux/ba-p/1056267.
Please check out the Q&A forum here – https://docs.microsoft.com/answers/topics/teams.html.