Why does my speaker’s third led indicator always on?

Why does my speaker’s third led indicator always on?

I have just bought anker soundcore pro plus on AliExpress. When I opened the box I’ve seen third incicator led is shining. I turned on the speaker, four indicator shined and then only third indicator shines. So it’s always shines. Is that a problem for long period? Is that a battery failure? If it’s a problem I wanna debut. Would you help me ? I’ll appreciate that

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