It does not have an internal battery but can use any battery pack that can do 100W output.

I pre-ordered this for a few reasons. One, my experience with butane irons was very different than yours I guess. I hated how long they took and how finicky they were. Then I had to find a safe place to put it while it cooled. This has a cap that can handle the high temp with no issue.

When I need a portable iron it’s to do small quick soldering with long waits in between. This seems perfect for that.

The art style is nice but the content makes no sense. Kanban and scrum are parts of agile. They are not their own systems.

Lean also doesn’t mean you have no money. It’s a system of manufacturing where you cross train people to do the jobs on either side of them so they can pick up slack if needed and keep things moving without hiring more people.