Please dispose of the device and all its components in a responsible and environmentally friendly way. You should follow local, state, and national governing ordinances and recycling instructions regarding the disposal or recycling of the device and its sensors, including batteries. The battery is most likely still functional after the sleep test, so you may consider using it in another appliance before disposing of it.
You may also participate in the WatchPAT One Green Program by using this link: https://www.itamar-medical.com/greenprogram/us/.