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| Don't keep fully charged Li-Ion in long term storage, they tend to bulge |
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| james_s:
--- Quote from: RoGeorge on January 19, 2023, 12:26:36 am ---What current voltage did it caught fire? Was that with or without the small Battery Management System PCB on top of the battery? The mobile phone cells always come with a small BMS inside. I know for sure the BMS will disconnect the battery at lower than 2.8V (it happened with a few batteries while I was discharging them to measure their capacity). The internal BMS is also supposed to disconnect the cell at more than 4.3V charging, or at a short circuit (high current, don't know which I value). So far never tested the overvoltage and the overcurrent limits. --- End quote --- I don't recall the voltage, it was a few years ago and there was obviously some drop over the wires anyway. It was a model aircraft battery without any BMS, I've heard other cases of them catching fire around 5-6V. There have been quite a few fires, mostly from people setting up their chargers incorrectly, some of the older chargers didn't monitor the balance leads. Multiple guys on the RC forum lost their houses, several others had workshops and cars burn down. |
| JDubU:
--- Quote from: amyk on January 19, 2023, 01:52:56 am ---You'll get HF if the battery burns (due to fluoropolymers being used in the separator), but the electrolyte itself is relatively tame. --- End quote --- Take a look at this: https://www.nature.com/articles/s41598-017-09784-z |
| tooki:
--- Quote from: Bud on January 18, 2023, 09:09:25 pm --- --- Quote from: tooki on January 18, 2023, 07:05:39 pm ---.. if a device comes in with a swollen battery, they won’t touch the battery in-store, and instead replace the device and then refurbish the swollen device in a repair depot. --- End quote --- That is just "think of the children" mentality. --- End quote --- No, it’s simple risk mitigation (which insurance companies likely insist on) and time management. It’s not worth the time of store employees to figure out if a battery is discharged enough to be worked on safely. (A battery replacement is a 15 minute schedule slot.) Just send the customer home happy, quickly, and let the repair depot deal with it later. The point is, batteries in that state are certainly not safe enough to be put back into service!! --- Quote from: SiliconWizard on January 18, 2023, 09:17:00 pm --- --- Quote from: tooki on January 18, 2023, 07:05:39 pm ---A swollen lipo pouch belongs in exactly one place: the recycling bin. Continuing to use it is asking for trouble. --- End quote --- Yes, but not in the general trash bin, please. This is dangerous and illegal in most places. Dispose of it in appropriate bins. --- End quote --- Yep, which is why I said recycling, not trash. (I assume enough intelligence on the part of our readers to understand that this means the correct bin for the item being disposed of. …ok, fair enough, given that this dude wants to reuse it, it probably does need to be stated explicitly!) Put used batteries into the battery recycling bin. |
| magic:
--- Quote from: tooki on January 19, 2023, 07:42:00 am ---The point is, batteries in that state are certainly not safe enough to be put back into service!! --- End quote --- They certainly don't look good, and I imagine that alone would be an overriding concern at Fruit Inc™ >:D This whole thread rises more questions than it answers. Maybe some experimentation would be in order. Are discharged batteries really inert and inflammable? What if you outright put one in fire? Is there enough HF in a swollen battery to actually poison yourself? How many normal charge cycles before a swollen battery catches on fire? Does it ever? :popcorn: BTW, I have seen a swollen battery which apparently had been in use for a while, without the owner noticing. The owner only complained about capacity not being what it used to be. |
| RoGeorge:
--- Quote from: tooki on January 19, 2023, 07:42:00 am ---(I assume enough intelligence on the part of our readers to understand that this means the correct bin for the item being disposed of. …ok, fair enough, given that this dude wants to reuse it, it probably does need to be stated explicitly!) Put used batteries into the battery recycling bin. --- End quote --- Would you kindly fuck off? Hold your innuendos for yourself. Here's a basket for your advice: You are on my ignored users list. |
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