Why is it bad to burn batteries?

Question

Why is it bad to burn batteries?

Answer 1

burn some and find out! I'm 105% certain batteries do not contain any harmful substances.

Answer 2

Most batteries will explode when burned.  Depending on the type of battery, toxic material and gases may be released.  Even if the battery has no directly toxic material, the heat may cause some materials to combine into substances you don't want around.  

  

  

Answer 3

Perhaps you should take a look at a pair of alkaline cells and read the ominous printing. Incineration of alkalines and most rechargables may cause an explosion because of some toxic and corosive acids inside. If a rechargable, it may release toxic chemicals into the air.