Now, there are some tricks to get more battery life out of your iPhone, such as not using it, killing background activity and notifications, etc., but a so called "dark mode" can be a major power saver: How to squeeze more battery life out of iPhone X
Therefore it is really exciting that Microsoft Teams on iOS now supports a Dark Theme, since version 1.0.66.
Version 1.0.66 where the darkness begins...
So, how do you turn it on?
1. Click the three bars in the top left of the application to expose your profile and click Settings.
2. Click General.
3. Flip the switch to turn on "Dark Theme" and close the application.
4. Next time you start your Teams client it will look much cooler (and preserve battery life)
If you want to use the dark theme even on your desktop you find a nice guide here.
I would also like to point out that this is an idea coming from users of the Microsoft Teams mobile app through Uservoice. Please continue to send in new ideas and vote on Uservoice to make Microsoft Teams even better in the future.