由于手机电池过热和爆炸的报道，三星要更换数百万台Galaxy Note 7手机，我们不禁好奇：如果手机出现过热、冒烟现象，甚至真的着火了，我们应该怎么做？

为了寻求答案，我们再次咨询了电池专家：麻省理工学院材料化学专业John F. Elliott教授唐纳德?R?萨德维(Donald R. Sadoway)博士。萨德维教授曾帮助我们解释了电池爆炸背后的科学原理。

那么，萨德维教授对电池过热的建议是什么呢？首先，如果手机正在充电，在确保安全的情况下，要立即拔掉电源。然后，你可以用灭火毯捂住手机。但他同时也指出，电池本身包含了着火燃烧所需的所有材料。也就是说，一旦电池过热，与手机周围的氧气产生反应并燃烧，这个方法可能无法奏效。

“电池早期过热是可以阻止的”，他表示。“但处于过热晚期的电池就如同一辆失控的大货车。”

这时，最好的办法就是离开手机，并立即拨打911。如果你手机的是三星Galaxy Note 7，最好另换一款，以防万一。据报道，即便是Note 7s，也存在电池问题，所以明智之举还是选择别的手机品牌吧。

作者：Alex Fitzpatrick

翻译：刘进龙/汪皓

As Samsung works to replace millions of Galaxy Note 7 devices amid reports of overheating and exploding batteries, we were curious: What should you do if your smartphone starts to overheat, smoke, or, worse, actually catch fire?

So we reached out once again to battery expert Dr. Donald R. Sadoway, the John F. Elliott Professor of Materials Chemistry at the Massachusetts Institute of Technology, for an answer. Sadoway previously us helped explain the science behind exploding batteries.

His advice for overheating phones? First, if the device is plugged in, unplug it immediately, as long as it’s safe to do so. Second, you can try smothering the phone with a fire blanket. But as Dr. Sadoway pointed out, batteries already contain all the fuel they need to burn. That means smothering might not work like it would with a fire that’s fueled by the oxygen around it.

“Early stage overheating may be stopped,” he says. “But late stage is a runaway freight train.”

The best idea, then, may be getting away from the device and calling 911 immediately. If you already bought a Samsung Galaxy Note 7, it’s probably a good idea to swap it for another smartphone. (Even the replacement Note 7s are reportedly having battery problems, so it’s wise to pick a different model.)