Ikea Motion Sensor not reporting Battery

Hi,
i have a motion Sensor IKEA. All works fine beside: its not reporting its battery status.
The only message i get ist this :

{"topic":"zigbee2mqtt/Bewegungsmelder","payload":{"occupancy":true,"linkquality":15},"qos":0,"retain":false,"_msgid":"aa31eeab.c4f43"}

The Firmare from my CC is 20190608

Anything wrong here ?