I am confused. The OP said the instructions say not to dispose in domestic waste because of the battery and the responses are talking about sharps boxes.
The Libre sensor has no sharp item on it.
A Libre sensor's "filament" is inserted into the skin. The "filament" has chemicals applied to it that the sensor uses in part to measure the concentration of glucose in the interstitial fluid found under the skin where the sensor is inserted in order to give a glucose reading.
Because the filament is inserted into the body, and has
bodily fluids on it, once the sensor is removed it ought to be treated in exactly the same way as a blood glucose test strip. As medical waste.
The
only appropriate way to dispose of a dead sensor which has a filament attached to it which has bodily fluids on it, is to put the sensor in a medical sharps bin.
Regardless of the fact that the sensor contains a battery.
It's not ideal, but until Abbott institute a sensor recycling scheme, that's the best we users can do.
I certainly don't intend spending time dissecting a Libre sensor to remove its battery so I can dispose of that separately in accordance with my local council's battery disposal policy.
All flash and continuous glucose sensors use a filament to obtain a glucose reading, so all sensors ought to be put in a sharps bin when they stop working.
Medical waste isn't treated and disposed of in the same way as general household waste and recycling. At least, it shouldn't be.