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I would be afraid of melting/burning the plastic around it.
I will apply the solder with solder wick, not directly with the soldering iron. I know I could cause some damage to the plastic, but the problem is that the watch is not charging anymore.
Also I am not sure how stable and healthy/allergic is solder - it is not just Sn but other metals (possibly even lead) and also flux and other chemicals. Also tin is relatively soft and may oxidize too.
The solder is lead-free. I will clean the flux after the work and I'm going to start using the silicone cover, not only to protect my skin, but also to reduce oxidation as much as possible.
As I said, nickel-gold plating would be ideal, but I don't think I'm going to follow that route.
adjtm
I would be afraid of melting/burning the plastic around it. Also I am not sure how stable and healthy/allergic is solder - it is not just Sn but other metals (possibly even lead) and also flux and other chemicals. Also tin is relatively soft and may oxidize too.