Could not render template Batterie-Status with attributes.battery_level

[Klex1404]

I have this error as well during first boot.
However, after a minute or so the value becomes visible.
Maybe also look at:

Home Assistant 0.41.0 Update | Battery Values are Gone

You can (or: have to) create template sensors for each device: platform: template sensors: bat_livingroom: value_template: '{% if states.zwave.danfoss_z_thermostat_014g0013_heating_1_4 %} {{ states.zwave.danfoss_z_thermostat_014g0013_heating_1_4.attributes.battery_level }} {% else %} n/a {% endif %}' friendly_name: 'Thermostat Living Room' unit_of_measurement: '%' entity_id: zwave.danfoss_z_thermostat_014g0013_heating_1_4 and then create a group/card that …