tmux plugin showing battery level
There's already another plugin for the same thing called tmux-battery, but this one is just simpler and adjusted to my needs.
Installation with Tmux Plugin Manager (recommended)
Add plugin to the list of TPM plugins in .tmux.conf:
set -g @plugin 'pwittchen/tmux-plugin-battery'
Hit prefix + I to fetch the plugin and source it.
If format strings are added to status-right, they should now be visible.
In order to see battery level via this tmux plugin, add the following command to your .tmux.conf file:
#{battery_level}