Low battery level detection & notification for all battery sensors

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There is a special card for batteries that is useful here as well:

  - type: custom:auto-entities
    card:
      type: custom:battery-state-card
    filter:
      include:
        - attributes:
            device_class: battery
          state: "< 50"  # Changed for the example
      exclude:
        - integration: mobile_app
    sort:
      method: state
      reverse: true
    card_mod:
      style: |
        ha-card {
          border: none !important
        }

Here is my extended setup, showing all batteries:
image

Full config:

type: custom:vertical-stack-in-card
title: Batteries
cards:
  - type: custom:auto-entities
    title: Batteries needing attention
    card:
      type: custom:battery-state-card
    filter:
      include:
        - attributes:
            device_class: battery
          state: < 25
      exclude:
        - integration: mobile_app
        - name: Kostal-*
    sort:
      method: state
      numeric: true
    card_mod:
      style: |
        ha-card {
          border: none !important
        }
  - type: custom:auto-entities
    card:
      type: custom:battery-state-card
    filter:
      include:
        - attributes:
            device_class: battery
          state: unknown
        - attributes:
            device_class: battery
          state: unavailable
      exclude:
        - integration: mobile_app
        - name: Kostal-*
    sort:
      method: state
      numeric: true
    card_mod:
      style: |
        ha-card {
          border: none !important
        }
  - type: custom:auto-entities
    card:
      type: custom:battery-state-card
    filter:
      include:
        - attributes:
            device_class: battery
          state: '>= 25'
      exclude:
        - integration: mobile_app
        - name: Kostal-*
    sort:
      method: state
      numeric: true
    card_mod:
      style: |
        ha-card {
          border: none !important
        }
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