What is useful in old unusable batteries. DO NOT DISSOLVE THE BATTERIES! 

I'll show you what is useful in old, unusable batteries - what other benefits they can bring in the household and some homemade products and crafts.
Yes, not all batteries can provide this benefit, since they differ in their design, but not in the principle of operation.
Also remember that used batteries must not be thrown away - they must be disposed of. Do not throw away batteries!
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