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My lithium battery on my phone has significantly decreased in usage time and has bulged up, causing it to generate heat during charging. As mentioned in the article, the air can be released. However, during the process of release, a hole was broken in the outer metal skin, and a liquid with a special odor flowed out from inside. Now, I would like to know if this battery can still be used. If it can be used, are there any precautions to be taken? Is the flowing liquid harmful to the body?

Never use it

The usage time of lithium batteries has significantly decreased, and they bulge and generate heat during charging. This is because the water content of this battery was not well controlled during the production process, or there was a slight short circuit inside. Lithium batteries cannot contain water, even in small amounts! So punching holes to release gas is an incorrect statement, and the presence of water can cause the components inside lithium batteries to decompose, bulge, increase internal resistance, and become unable to charge, or even rupture. What flows out is a spoiled electrolyte, which was originally an organic solution of lithium hexafluorophosphate, non-toxic but corrosive.

What you're talking about is leakage. Normally, lithium-ion batteries won't leak. Mobile phone batteries are made of lithium-ion batteries, and as long as the quality is not too poor, they won't leak because the outer layer of lithium-ion batteries is either a rigid shell or an aluminum shell. But over time, it may bulge a bit, but it doesn't affect the use. Poor quality ones will bulge like a big belly woman~

Polymer lithium-ion batteries, also known as flexible packaging lithium batteries, have an outer layer of polymer. If punctured, there will be a liquid like the one you mentioned flowing out, with a slight fragrance (which many people find fragrant), and it will bulge, which can cause a fire in severe cases. So generally, do not disassemble the battery or puncture such batteries. Don't be scared by what I said. These types of batteries are widely used nowadays and generally don't pose any danger.

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