Doesn't work with the new (at the time of writing this) Samsung Galaxy Watch4 except for the fast charger/largest charger I have and then gets a bit warm. Might work on older watches but have tried both which I've gotten in several different chargers plugged into a computer etc and while the original charging puck works it doesn't work in all of these cases. Too bad. I think if you're just going to use a super fast charger, go for it.
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