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I purchased two. My son took one in his trip and I took the other in my trip. He said the same thing you did. He has iPhone 8 and I had iPhone 6 and mine charged quickly. Others with me were also using mine (two plugged in and being used as they charged) so not sure why one of ours works and the other phones being charged throughout the day were Samsung and newer iPhones. Doubt this was any help since we ourselves cannot determine why we bought same day and the one he took was extremely slow but it served its purpose as the battery would have been dead, but still expectations from specs seems off on at least one of ours.
Sorry, there was a problem. Please try again later.I fully charged mine before using and had no issues charging my iphone 11. Charged rather fast using the usb-c fast charging cable. No issues.
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