this post was submitted on 31 Oct 2025
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They put fuses on every single cell, another one between both halves of the setup, and monitor everything using a BMS. I wont claim that this thing is as safe as a commercially available product but treating this as if it where outrageously dangerous is misrepresenting things as well.
Yeah, I didn't watch this video b/c I'm at work, but I have seen his ebike video so I'm assuming the construction is similarly well thought out.
It's just that all the fuses and BMSs can't protect against a dodgy cell that decides to self-immolate. For cheap, disposable devices that are only meant to be charged 5-10 times or less and then thrown away, I'm super wary of the batteries that are chosen for those. Have seen too many things burst into flames and even expensive well cared-for devices turn into spicy pillows.
Good things to do, but it still only takes on poor quality cell to go up in flames and the rest will quickly follow.
Still very interesting.