Most button-type batteries are ' zinc-air batteries ' that use oxygen in the air for the positive electrode and zinc for the negative electrode. The advantages of 'zinc-air batteries' are that the ...
New Delhi, Apr 30 () Vedanta Group firm Hindustan Zinc on Friday said it has set up an oxygen bottling plant at the Rajsamand district of Rajasthan which is producing 500 cylinders of life-saving gas ...
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