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The Anker Powerbank 347 and several other models like Powerbank 525 and Powerbank 537 are equipped with Trickle Charging Mode for charging low-powered devices and accessories. However, the provided documentation does not mention whether the model you asked about (Anker Power Bank 20,000mAh, 30W) specifically supports activating Trickle Charging Mode through a second press of the power button or any other method.
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