You've been using your power bank wrong, and airline rules make that obvious

核心亮点：你一直用错了充电宝，航空公司的规定正好揭示了正确的使用方式。通俗解读：很多人买充电宝只盯着“毫安时”这个数字，比如“20000mAh”就觉得很大，但真正决定充电宝能用多久、能不能带上飞机的关键其实是“瓦时”（Wh）。航空安检要求瓦时超过100的充电宝不能随身携带，这意味着同样的毫安时，如果电压不同，实际能量差别很大。比如一个标称20000mAh、电压3.7V的充电宝，瓦时只有74，可以放心登机；但如果电压是5V，瓦时就会超过100，可能被拦下。很多人无意识地在“超规”使用，却不知道自己买错了产品。实际影响：看懂这个规则后，你不仅能顺利过安检，还能更聪明地选充电宝。出差带笔记本电脑，需要高瓦时的大块头；日常给手机应急，小瓦时轻便的反而更好。别被广告上的大数字忽悠，下次买充电宝先看Wh标志，旅途就会少很多麻烦。

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