Called phillips consumer dept. they said they do not have recycling program for heads.
They said the plastic can be recycled as plastic item. just cut off the brush and remove the magnets. If the bottom goes bad remove the battery and recycle it. the plastic around the battery can also be recylced.
If you are wondering you can not have the brush head reconditioned. hope this helps, i have 10 heads i am recycling.
you can use the magnets on the fridge to hold notes up or pictures whatever you can.