Carefully separate the glue from the tangs holding the button cover to the battery assembly and outter housing.

There are four tangs in total, three are easy to access with the gasket out of the way.

I used an exacto knife, but becareful to not cut any wires coming down from the ear loop, or destroying any of the detents which hold the button cover in place.

Take your time, the attachment to the battery housing is much stronger than the strength of the plastic cover.