Which of the following types of batteries are considered as environmental hazards?
Each correct answer represents a complete solution. Choose three.

A.
Button cell

B.
Lead-acid

C.
NiMH

D.
NiCd

Explanation:

The following types of batteries are considered as environmental hazards:
Nickel cadmium (NiCd)
Lead-acid
Button cell
Nickel cadmium (NiCd) batteries contain nickel and cadmium. Cadmium is highly toxic.

Lead-acid batteries contain lead that is considered as environmental hazard.
Button cell batteries contain mercury that is considered as environmental hazard.
Answer option C is incorrect. Nickel metal hydride (NiMH) batteries are not considered as
environmental hazards.
Reference: “http://en.wikipedia.org/wiki/Battery_(electricity)”