YCC Posted October 19, 2023 Share Posted October 19, 2023 Shall I worry the fire danger of LG M50T battery in Commander 1st generation? I attached the spec of commander as follow. Do you have any ideas pertaining to the issue? Quote Link to comment Share on other sites More sharing options...
alcatraz Posted October 19, 2023 Share Posted October 19, 2023 Notif they've been changed. There was a recall if memory serves. 1 Quote Link to comment Share on other sites More sharing options...
alcatraz Posted October 19, 2023 Share Posted October 19, 2023 It could be an old spec sheet. It's possible they all were changed before customer orders went out. 1 Quote Link to comment Share on other sites More sharing options...
YCC Posted October 19, 2023 Author Share Posted October 19, 2023 2 minutes ago, alcatraz said: Notif they've been changed. There was a recall if memory serves. I am not able to check the version of the battery until I teardown the battery. Does it make sense or how to quickly check my version of battery? Quote Link to comment Share on other sites More sharing options...
techyiam Posted October 19, 2023 Share Posted October 19, 2023 But has anyone reported battery fires for a wheel using LG M50T cells in 8P 3600Wh battery configuration? 1 Quote Link to comment Share on other sites More sharing options...
alcatraz Posted October 19, 2023 Share Posted October 19, 2023 You can often read the cell type on the sticker that's on the battery heatshrink. It means that you often just need to take off the side panel. 1 Quote Link to comment Share on other sites More sharing options...
alcatraz Posted October 19, 2023 Share Posted October 19, 2023 In an 8P configuration fires are less likely because the cells will never really get hot, but with age the internal resistance grows (and thus heat). Sooner or later something could happen. 1 Quote Link to comment Share on other sites More sharing options...
alcatraz Posted October 19, 2023 Share Posted October 19, 2023 I've speculated that even bad cells show symptoms before they burst into flames. So by checking cell group voltages you SHOULD be ok. But I could never recommend you to go that route. It's a high risk low reward route. Let's say they check out fine one month and 2 months later they're already bad but you didn't check and bam. It's hard to say for sure. Also I'd like to see packs where the cells aren't pressed up tight against eachother. Just by having that 1-2mm gap from using carriers can make all the difference if one cell overheats. 1 Quote Link to comment Share on other sites More sharing options...
alcatraz Posted October 19, 2023 Share Posted October 19, 2023 (edited) You know what you could do if you're DIY and adventurous. Rebuild the M50T packs with fuse wire. At 8P you can actually do that. If one goes you have 7, 6... left to keep you upright. It's what these DIY powerwall guys do with random cells. They run those cells untill there's nothing left of them, with fusewire. The fires happen when 1 cell goes (shorted) and then the neighboring healthy cells dump their charge into the shorted cell. It's like an explosion. With fusewire that bad cell gets disconnected when it shorts out. A similar thing happens when cells are pressed together (no cell carriers). One cell shorts internally, gets hot enough to melt the heatshrink and the casing shorts out with the neighboring cells, causing a cascade failure. Edited October 19, 2023 by alcatraz 1 Quote Link to comment Share on other sites More sharing options...
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