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iFixit wants to fix the soldering iron
(www.engadget.com)
This is a most excellent place for technology news and articles.
I would not want multiple cells for reasons of ergonomics and convenience.
I probably don't need 100W for most field soldering. 60 is plenty, and temperature-controlled soldering irons usually don't need to pull high current continuously. It would need 60W for maybe 10 seconds when powered on, and when heating something large. The rest of the time, it takes relatively little power to keep the tip hot.
What I'm describing is, of course not the right tool for production soldering. It's for field work.
I've got a Ts80p which is a qc3 usbc soldering iron for that. It's crazy powerful for it's size and runs off a pretty small anker powerbank. You could slide that into your sleeve to go portable and one handed
That's similar to the iFixit iron, as is the less expensive Pinecil.
Those are probably the best options currently available, but I want something more compact and self-contained.