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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.
It’s a multi-use battery.
The battery can be used to charge whatever you want. A phone, laptop, headphones, or anything else with USB. Also, the battery is user replaceable and the product repair diagrams are posted online.
IMHO, it looks like they’re practicing what they preach, and it’s all designed for longevity and right to repair.
I edited my original post. Thanks for bringing the pie!