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The Anker PowerCore Select 20K (Dual‑Port) is not designed for pass‑through charging, which means: You should not charge the power bank and another device at the same time Anker does not recommend or officially support using it this way Some users report that it may appear to work briefly, but this is not reliable and not supported, and it can: Reduce charging efficiency Cause overheating Shorten battery lifespan What Anker recommends ✅ Charge the power bank first ✅ Unplug it ✅ Then use it to charge your devices
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