- platform: template
  sensors:
    devices_with_low_battery:
      friendly_name: "Devices with low battery"
      unit_of_measurement: devices
      value_template: >-
        {{ states.sensor
          | selectattr('attributes.device_class', 'eq', 'battery')
          | map(attribute='state')
          | reject('in', ['unknown', 'unavailable', 'Ok'])
          | map('int', -1) | select('le', 97)
          | list | count
        }}
      icon_template: >-
        {% if is_state('sensor.devices_with_low_battery', '0') %}
          mdi:check-circle
        {% else %}
          mdi:battery-alert
        {% endif %}