DIY Battery Box with 18650 sized 3.7V nominal lithium ion batteries
[To see the build without all the planning, click here to jump there.] Back in the day, 18650 lithium ion batteries were all the rage, and still are. So I had some experience with sourcing these and looking for battery holders. Unfortunately, 18650 battery holders were not so easily available, especially in low quantities. I still have an unused aluminium