Battery sticker changed from white to black. What does this mean ?

[AC Question]

Battery was over heating days prior and draining quickly. Shut off with green android screen for over 3 hours. Then opened with 0% battery. Took out battery then saw sticker turned white to black. Orginal s5 battery

 

[itguyjax8430]

Battery was over heating days prior and draining quickly. Shut off with green android screen for over 3 hours. Then opened with 0% battery. Took out battery then saw sticker turned white to black. Orginal s5 battery

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It could mean its time for a new battery. Did you get the phone wet at all or anything like that?