I found out the hard way that the QI charger that came with the original Galaxy Watch ("1") does NOT charge my Galaxy Watch 4 Classic 46 mm. Which Samsung powerbank can charge the Galaxy Watch 4 directly (i.e. without having to plug in the original Watch 4 charging puck)?
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Congratulations! This solves my problem. Thanks a lot for the photo. Do you have the Watch 4 AND the Watch 4 Classic?! I only have one :)) But I got myself a Galaxy Watch ("1") as a spare while the other is charging...
The issue is if the QI in the battery pack supports the Galaxy Watches 4. I found that the Galaxy Watch 1 charger seem to start charging the Watch 4 as it should, but then it starts blinking after 10 seconds, and nothing happens. What a charming pair of watches!
Based on Fiona's advice, I bought a Samsung Wireless Battery Pack EB-U1200. It charges both my Galaxy Watch 4 Classic 46 mm and my Galaxy Watch ("1") without problems. The original chargers that followed each watch are NOT cross compatible. The Galaxy Watch 4 charger is NOT backwards compatible!