HomeMatic motion sensors without battery level

Hi,

I have connected my HA installation with my RaspberryMatic via HomeMatic integration.
Everything seems to work very well.

I wanted to monitor the battery levels of the HomeMatic devices. Therefore I created new entities with the template sensor integration.

With the door contacts everything worked fine.

Now I have the problem that my battery driven HomeMatic motion sensors don’t have a battery level attribute.

How can I monitor the battery levels of my HomeMatic motion sensors (binary_sensor.hm_sen_mdir_xxx)?

Thanks in advance.

Regards Kai