關於電池上出現一層結晶體

今天調鬧鐘時

我發現電池上有一層薄薄的粉狀白色結晶體

看起來像鹽巴

一碰就掉了

到底是什麼?

我很擔心是否是電池內了汞外漏

請化學達人幫幫忙!!

謝謝

Update:

鬧中還有在正常運作喔!

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