Energizer led initiatives to remove heavy metals like mercury from batteries. Other companies followed their example. When unsure how to dispose of batteries, contact a local electronics store or waste management company for guidance on environmentally friendly disposal. While CR2032 batteries contain no toxic metals or acids, disposing of multiple used batteries together poses a fire risk from potential short circuits, so they should be disposed of singly and separated from other metals in the trash.

1. Disposal of
CR2032
batteries
It is worth noting here that
Energizer is the company
which led the initiative to
eliminate heavy metals, like
mercury, from batteries.
Thanks to their efforts, other
companies followed suite.
Whenever you don’t know
how to dispose of a battery,
contact your local electronics
store or waste management
company. They can point you
in the right direction and help
you get rid of your used
batteries in the most
environmentally friendly way.
http://www.cr2032.co/environment-article.html

2. Thankfully, CR2032 batteries
don’t contain any toxic metals
or reactive acids.
• By the time your CR2032
battery loses its charge, the
highly reactive lithium inside
of it has been transformed
into a non-reactive metal
compound.
• Used CR2032 batteries don’t
generate that much heat on
their own, and they pose no
risk of releasing chemicals
that could make it into your
local ecosystem.
• Having said that, there are a few risks
that go along with disposing of a large
number of used CR2032 batteries at
the same time.
• Many used CR2032 batteries still
contain some charge. If you place
them next to one another or throw
them out together, they can short
circuit, explode, and cause a fire.
• Our recommendation is to avoid
disposing of multiple CR2032 batteries
at the same time.
• If you have a lot of them, stagger
their disposal so they never touch
each other in the trash.
• You should also avoid placing
other metals next to your CR2032
batteries. They can cause your
used batteries to short circuit and
explode.