Replacement Battery for Visonic Powermax Pro

hi this is a short demonstration on how to replace the battery on Ava Sonic Power Max or some of the earlier Power Master sensors so usually you'd have this up on your wall in the corner or flat on the wall but I'm going to show you just on the desk just so I can show you exactly how to do it and what bits to look for so I've got a small Phillips screwdriver so first off I will loosen off the screw you haven't got to take this completely out just loosen it off and the front cover will just lift off from the top you have a little lug which goes straight in the top there I put that to one side so inside there you have the pyro in the middle that's the sensor part don't touch that because if you put a fingerprint on that it can distort the PIR the infrared lines coming out and you can get false alarms so you would get the little top plastic bit there and flick it up and the board should ju