My right eyebrow starts to rise at about 45°C/113°F, despite the fact that according to ASTM C1055, the average person can touch objects up to 60°C/140°F for up to five seconds without sustaining irreversible burn injuries.
Over the past few months, I've tested over two dozen hand warmer power banks, and none had what it took for me to publish a review on them. Some were dead on arrival, had an absurdly short runtime, or got hazardously hot.
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