- alias: system_low_battery
  initial_state: 'true'
  trigger:
    - platform: time
      at: "20:30:00"
  condition:
    condition: template
    value_template: >
      {%- set battery_alert_threshold = 15|int -%}
        {{ states | selectattr('attributes.battery_level', 'defined') | selectattr('attributes.battery_level','<', battery_alert_threshold ) | list | count >= 1 }}
  action:  
  - service: notify.telegram
    data_template:
      message: >
          {%- set battery_alert_threshold = 15|int -%}
          {%- set low_batteries = states | selectattr('attributes.battery_level', 'defined') | selectattr('attributes.battery_level','<', battery_alert_threshold ) | map(attribute='name') | list | join(', ') -%}
          \U0001f6a8 Low batteries in: {{ low_batteries }}