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.
Notifications turned off, Background App Refresh turned off, didn't use the application over the weekend only to find that Teams used 50 minutes of background time over the last day. I'd say it's not significantly improved.
Performance has been and continues to be a big focus area for Teams. One main area we have made improvements in is responsiveness for the most frequent user actions of switching between Chat, Channel, and Activity. We are also focused on reducing resource consumption and application load time. More improvements are on the way.
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Thank you for the feedback. This feature request is now being actively worked upon by the feature team. I’ll update this topic as we move along through the development.
Please keep the feedback coming. We appreciate all the responses.
The feature team is hard at work on this feature. We will share more news as we get closer to release.