Batteries used in devices should not dump in recycle bins or within household garbage. Most of these batteries contain several harmful but valuable materials like mercury, cadmium, lead, lithium, zinc, nickel, and silver. One should be more cautious before disposing of batteries improperly.  Dumping them in landfills or incineration leads to dangerous explosions. That not only an immediate threat to others as well as contribute to environmental damage.  Also this lead to destroy of this ideal resources and affecting economy. So whether these dead batteries are used or discharged it needs to be disposed properly.