> What are the statistics on lithium-ion battery failures? Are they dangerous full stop, dangerous in certain scenarios If you wanna get more paranoid: https:/

> What are the statistics on lithium-ion battery failures? Are they dangerous full stop, dangerous in certain scenarios If you wanna get more paranoid: https://www.reddit.com/r/spicypillows/ https://www.reddit.com/r/spicypillows/ Jokes aside, hard to say, but it's mostly scenarios. Some batteries have proper venting (or puffing), protection circuits and sensors to prevent thermal runaway, and they are very unlikely to fail catastrophically, they would stop working before, generally. Now those take more space, so such features are often offloaded onto the PCB designers to make them fit, and you may trust them more (or less) than the battery manufacturer. More or less the same can be said about the charging circuit, and how it might handle low voltage or trickling/stop charge. Personally I've seen flashlights that burn through the 18650 without respecting the minimum voltage whatsoever, and that would put 5V to charge. There a proper battery will refuse to charge or just die, but an unprotected one might catch fire. As anecdotal data, after dozens and dozens of devices, I've only owned two batteries that became spicy (without catching fire), a Chinese-brand laptop and a cheap quadcopter battery.