“Does it do passthrough charging or does it have to be disconnected from main power? Can I fully charge the brick then it charges device?”
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Regarding passthrough charging for the Anker Power Bank (20,000mAh, 30W): Only the USB-A port can be used to charge devices, while the Micro USB and USB-C ports are designed solely for input, meaning these are used to recharge the power bank itself. Based on the information provided, it does not mention support for passthrough charging (simultaneously charging the power bank while charging another device). You can fully charge the power bank first and then use it to charge your devices through the USB-A port. Additionally, for charging low-powered devices like Bluetooth earbuds or smartwatches, activating the trickle-charging mode will optimize the process.
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