this post was submitted on 31 Oct 2025
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That guy's got some brass ones, lol.
I've upcycled disposable vape batteries for lots of projects, but never anything that draws significant amounts of current. Usually powering ESP8266/ESP32 projects that draw a couple hundred mAh at most.
While I'm all for keeping thing out of the landfill, I would be absolutely terrified to put that many questionable quality lithium batteries into an array let alone try to draw any substantial amperage from them.
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.