Dynamic template_icon Command line Sensor

Configuration
3

To expand on patkap…
The command_line sensor does not implement icon_template.
So to do what you want to do, create a new template sensor like this:

   - platform: template
     value_template: {{state.sensor.hombot_battery.state}}
     name: HomBot_Battery_Display
     unit_of_measurement: "%"
     icon_template: "{% if is_state('sensor.hombot_battery', '100') %}mdi:battery{% else %}mdi:battery-unknown{% endif  %}"
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