Unverified80% confidenceTradeoffTime unknown
USB充电款加热越快、温度越高越舒缓,但电池模块会增加重量和硬度导致贴身佩戴闷热异物感;自发热款轻薄透气但热力弱——通勤久坐选USB可拆卸电池款,运动/睡眠选自发热薄款
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