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Can I use the charger from my Apple Watch 1st Generation to charge an iPhone 8/iPhone X?
No. Those aren't Qi-compatible chargers.





I use an S7 for work and have one of these to try out with the X. It's a 3-coil charger so it should work well...

http://www.samsung.com/us/mobile/mo...s-charging-convertible--black-ep-pg950tbegus/


eppg950tbegus-gallery5-0323
 
Can I use the charger from my Apple Watch 1st Generation to charge an iPhone 8/iPhone X?

Aside from not being compatible, even if it could, I don't know that the Apple Watch charger could even provide enough power to charge the iPhone 8 efficiently or make enough contact with the small charging puck.
 
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