Lidl sander battery (Craiglockhart EH14)

Hi. I think there is a problem with my Parkside Battery of charger unit for the sander. The green light is on when I put the battery in the cradle charger. Even though it will not be fully charged. when I put the battery into the sander there is no power.
Does anyone have a working one of batteries that I could come and test so I know where the fault is before going and getting any new parts?
I just want to test it.
Thanks