Icon template

Try putting a dash (-) after/before the % in the statement. That cleans up the spaces in the jinja code. I find more consistent results with dashes:

icon_template: >
          {%- if states.zwave.multisensor_chambre.attributes.battery_level|int < 20 -%}
            mdi:battery-alert
          {%- else -%}
            mdi:battery
          {%- endif -%}

You also have a quote at the endif which seems odd.

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