How to replace the PC062 battery?

The top snaps on and off. It's difficult to prise the off the top with hands because it's tight as it needs to be waterproof. If you use a screwdriver you will probably mark or damage the case. What we do is squeeze the beacon very slightly using a vice. Not too much otherwise you will damage the PCB. Squeezing the case causes the it to buckle slightly and you can then easily then take off the top.