The minimum current requirement (the lowest amount of power a device needs to draw from the battery so that it doesn’t turn off) for our battery is about 30mAh to 90mAh. When the required input of low-powered devices is less than the battery's minimum current requirement, there will be no current to charge the devices. 

You may check out our listings and see if your Anker power bank supports trickle charge mode. It provides safe and stable charging to low-power devices such as Bluetooth earphones and speakers.

To activate, press the button twice/hold the button for a few seconds. The LED indicator will turn green, indicating that the trickle charging mode is on. It will turn off 2 hours later when unused.