PSA: There's a bunch of videos floating around how to repurpose elfbar vape batteries, and the newest one is horribly unsafe.
https://www.youtube.com/watch?v=ehp23hrrEHY
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First, the guy uses soldering irons directly on the batteries (2:22). This is extremely dangerous, applying heat to batteries can and will send them into thermal runaway.
Next, he's smart enough to use a "balance" board to equalize the cell charges. But it would be way better to deplete the batteries individually, and it would be even better to run each one through a grader to determine capacity - only use matching cells in a parallel pack.
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Then, his PCB sandwich does not leave any air holes. The innermost cells will end up with trapped heat during charge and discharge, and likely overheat. Never do that. And never run battery packs without a bunch of thermal sensors throughout a pack.
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At 7:57 I lost my mind entirely. Way too thin wires to sustain the 30+ amps the pack will go through at the 100 watts @ 3.3V.
But that's not all: he soldered the balancing wires while the pack PCB is energized! One uncautious movement that ends up shorting two intra-pack balance wires and the entire pack's voltage will short out through this.
What a horribly unsafe video. He's damn lucky to not have ended up with a serious battery fire in his home.
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Here's how to do things correctly:
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Please don't go and create time bombs in your home.
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text/gemini
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