HA - YAML- Low Battery Level Alert

- id: 'low_battery_alert'
  alias: 'Low battery notification'
  description: 'Low battery notification'
  trigger:
  - platform: time
    at: '20:30:00'
  condition:
  - condition: template
    value_template: '{{ states | selectattr(''attributes.device_class'', ''eq'', ''battery'')
      | selectattr(''state'', ''lt'', ''20'') | map(attribute=''attributes.friendly_name'')
      | list | count > 0 }}'
  action:
  - service: notify.notify
    data_template:
      message: 'En eller flere enheder har lavt batteri:

        {{ states | selectattr(''attributes.device_class'', ''eq'', ''battery'') |
        selectattr(''state'', ''lt'', ''20'') | map(attribute=''attributes.friendly_name'')
        | list | join('', '') | replace(" battery level", "") | replace(" Battery
        Level", "") | replace(", ", "\n") }}

        Du bør oplade eller skifte batteriet.'
  mode: single