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What do you guys think of these cheapo BMS? Get or pass? https://www.amazon.com/dp/B09Z6N4CBN https://www.amazon.com/dp/B07T8NWKV7 ... context I got some Ironworks batteries, and the BMS and one of them is fried. I'm gonna replace the BMS and thought it would be a considerable additional cost...

I've got 2 14.5v LiFePo4 batteries, and I'm fairly poor still. Thinking of charging it with the car battery using one of these. Or more accurately 4 of them in parallel. Is this reasonable?

Ok, so I found this. https://www.aliexpress.us/item/3256804906372669.html Really cheap LiFePO4 batteries. 70 bucks for 400Ah. Thing is, I don't want to burn to death. So, just how bad can someone make a battery? Is there a limit to how bad a battery can be? Are they lying? How do I get a good...