Is anyone familiar with the battery for the Fenix TK16 flashlight?

This is a 5000mAh battery, 21700 3.6V 18Wh

I am specifically asking about charging via USB cable. How do I know when the charging is complete, if there is no built-in LED that would light up in the appropriate color?

This is a 5000mAh battery, 21700 3.6V 18Wh

I am specifically asking about charging via USB cable. How do I know when the charging is complete, if there is no built-in LED that would light up in the appropriate color?

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