Having issues with zigbee being Unavailable, never reporting battery

I have connection with my temp. TH01 sonoff but I cannot see the connection line

Perhaps too late for many, but nevertheless I’ll post my outcome troubleshooting one of the Sonoff DS01 connection issues I had.

Check the clip that holds the battery for it to be too wide, so the clip doesn’t connect correctly to the + and the - side. Just gently press the clip without the battery in it.

When the clip is adjusted correctly, a red led will be lit on the bottom side of the PCB for each time the DS01 is in state closed or open.

I hope this may help others troubleshooting their Sonoff DS01.