Not sure what to make of this but batteries replaced and tamper faults are recognised by the panel however not if they are removed from their position I.e you can remove the battery and take the pir off the wall and the system would be none the wiser. However as its a new battery if you were to open up the pir it would go into temper

This is, sadly, normal, that if you were able to defeat the tamper (or there is no back tamper) you would be able to freely remove devices

for a certain period before the 'polling' or 'supervision' realised the device was missing, this is the biggest reason for ditching 1-way wireless systems TBH.

 

Anyway glad the tamper is working.