What is the button for in 3.1?

Please help me understand a button/sign - "MINUS SIGN INSIDE a CIRCLE" - that appears in my 3.1 A ([email protected]) Notification strip (after swiping from above) between the battery and flashlight buttons.

What is the button for in 3.1?

Omul Omul
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Please help me understand a button/sign - "MINUS SIGN INSIDE a CIRCLE" - that appears in my 3.1 A ([email protected]) Notification strip (after swiping from above) between the battery and flashlight buttons.


Sorry for a stupid question, but I am not experienced in cells and the 3.1 manual is extremely meager and poor.


Thank you very much for assistance and help.
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