Fire extinguishers can't be disposed of in any domestic waste bin service.
You can dispose of them at the Community Recycling Centre FREE of charge
They can also be dropped off at a Household Chemical CleanOut event. It's a FREE service for the safe disposal of a range of household chemicals and other items that could harm to human health and the environment if they are not disposed of correctly.
Keep an eye out on the Cessnock Council Facebook page or Cessnock City Council website for events.