MAC Command - Battery level

MAC Command - Battery level

Hi,

I am using Actility Thingpark portal and I have the following question: I want to monitor the battery level of the device but the power source field displays the message "No information" (see the attached file).
How does it work the battery status monitoring? Which is the frequency of the battery status check?
I do not see the the DevStatusReq (0x06) command in the mac data download: is there a way to add this command to the mac data commands download? 

Thank you
Best Regards

Mario