But the element replacing the batteries in the mouse is not metal, like the original trap, but thin enough plastic to be able to replace the metal hatch. Difficult to firmly install, with a tendency to deform and unclip itself. Handle with care.
To assess the level of charge after charging, it takes at least turn off the mouse and on again. The system is more accustomed to batteries that are discharged and may indicate the wrong level if we systematically mouse rests on its base.