How to activate trickle-charging mode for Anker PowerCore Essential 20000?

Trickle-charging mode is used to charge low-powered devices and accessories including Bluetooth earbuds, speakers, and smartwatches. 

 

To turn on trickle-charging mode, press the power button twice until the first LED light turns green. Then, connect your device to the USB-A port to charge.

 

Please note that the trickle-charging mode will turn off automatically after 2 hours.

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How to activate trickle-charging mode for Anker PowerCore Essential 20000?
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