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Everyday science: batteries, appliances and safety

Check the environment and product conditions before relying on a single advertised number. Find comparison criteria and official references for batteries, appliances and everyday safety.

    12 posts

    Everyday science

    EV fast charging slows near 80%: a fault or three things to check?

    Separate high-charge slowdowns from errors using official guidance on displayed power, temperature, vehicle settings and whether to charge further.

    Raysonho @ Open Grid Scheduler / Scalable Grid Engine · CC0 1.0Archive photo · 2019 · Proportionally reduced for this list
    Photo details and source
    Archival fast-charger photograph taken on December 20, 2019; not a current Korean charging site or a test of the symptoms discussed here. Raysonho @ Open Grid Scheduler / Scalable Grid Engine · Wikimedia Commons · CC0 1.0. Wikimedia-provided proportional rendition; no local editing or crop.
    Everyday science

    Robot vacuum stops at a black mat? Check the cliff sensors first

    Official guidance on dark carpets and drop sensors, with a symptom checklist, model-specific limits and safe next steps for a robot vacuum.

    © 2006 Larry D. Moore · CC BY 4.0Archive photo · 2006 · Proportionally reduced for this list
    Photo details and source
    Archive photograph of a first-generation Roomba taken February 27, 2006, illustrating the form of a robot vacuum. It does not show the Roborock/eufy products discussed or a black-mat test. © 2006 Larry D. Moore / Wikimedia Commons · CC BY 4.0. Proportionally reduced for this list.