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  • Takaharu たかはるtakaharu
    Jun 30, 2026, 7:52 PM

    With airlines getting paranoid about exploding power banks, I think what I should pack for travel should be more towards getting a charger that wouldn't tie me down to a spot for too long.

    As a reminder, the battery capacity limit of 100Wh/160Wh only applies to lithium-ion batteries.

    What are examples that are 100Wh and under? Power banks rated for 27,000mAh, most laptops. (Fyi, if something with Li-ion that isn't a power bank does list capacity in mAh, you should be looking at the Wh instead, or (mAh/1000)*voltage

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  • Takaharu たかはるtakaharu
    Jun 30, 2026, 8:13 PM

    But why does it seem like they are on the rise as of late when the use of Li-ion cells has been around for longer?

    Well, the industry has shifted from using 18650 cylindrical cells that were in laptops up till a decade ago. The cylinders stopped the inside from expanding, but as they moved to pouches, that safety layer isn't there.

    Looking at r/spicypillows on Reddit, it looks like they have been neglected. Li-ion cells do not like being too close to 100% for too long, which is the case for when they were forgotten.

    What does that have to do with power bank fires? The expanding pouch would cause the anode and cathode to bridge a short, with nothing to limit/break the dangerously high amperage flow, hence generating so much heat that it starts a fire.

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