I did a test. 30 minute test. My watch only has 9% charge left. Connected this charger. After 30 minutes of charging, an increase from just 2% to 11%. Connected to my Fitbit charger. After 30 minutes, the watch was 22% charged. I disassembled the inside of this charger and there are only 4 wires from the pins straight to the USB connector. There is no intermediate circuit to increase the charging voltage. Hence the very very slow loading. Breaking down a thought wasn't that easy! It's garbage!
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