I have a defective lithium-ion battery, one that is bulging quite severely and is about 50 percent thicker in the middle than it is at the edges. While the battery still actually works, I have replaced it since it would no longer fit inside my mobile phone and was about to make the screen come loose.
Lithium-ion batteries can pose unique safety hazards since they contain a flammable electrolyte and may be kept pressurized. A battery cell charged too quickly could cause a short circuit, leading to explosions and fires.  Because of these risks, testing standards are more stringent than those for acid-electrolyte batteries, requiring both a broader range of test conditions and additional battery-specific tests.    There have been battery-related recalls by some companies, including the 2016 Samsung Galaxy Note 7 recall for battery fires.  
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Disposable primary lithium batteries must be distinguished from secondary lithium-ion and lithium-polymer ,  which are rechargeable batteries. Lithium is especially useful, because its ions can be arranged to move between the anode and the cathode , using an intercalated lithium compound as the cathode material but without using lithium metal as the anode material. Pure lithium will instantly react with water, or even moisture in the air; the lithium in lithium ion batteries is in a less reactive compound. Mistreatment during charging or discharging can cause outgassing of some of their contents, which can cause explosions or fire.