Fibaro Motion Sensor battery reporting 1%

Well one of my fibaro sensors was stuck in motion again so I removed the battery but it still wouldnt come out - did a 3 button reconnect - still stuck - so I thought it might be a battery issue - the motion sensor then came out of the stuck state and ST reported 1% battery life - which over 24hrs later hasnt changed …

I couldnt find a documentation for the interval to report battery life but this to me looks odd as it was a brand new battery obviously … could it be that the ST device handler doesnt report this properly?

I am using the “older” sensor not the 3.2 … with the regular non zw5 device handler