Yesterday I opened up an old electric toothbrush, had one normal battery (AA) and one rechargable battery. Only the normal one had this kind of mold fungus on it.
(Not native speaker, sorry if I misspelled something)
In: Other
The corrosive liquid inside the battery. Non-rechargeable batteries contain acids or bases that eat away the material of the battery to produce electricity. If you let a discharged battery linger too long the fluid starts eating through the casing and leaks. After that it dries into a crusty mess of dry acid salts and rust.
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