Alright, please keep the laughter to a minimum. This is not what I envisioned when I first began, but I guess itís what you get when you cross inadequate tools with a superficial understanding of electricity and total lack of preparation or patience. Here is my first attempt at an 18650 cell phone charger.
The plastic box is from Radio Shack. As recommended by Balou, I used the LM7805, which is a linear voltage regulator. It must not be terribly efficient because it gets really hot in use. I had to attach it to a piece of aluminum angle to help dissipate the heat and keep it away from the cells. The cells are connected through some magnets. Iím sure an actual 18650 holder would work better, but as I wrote, lack of preparation, etc.
So, itís not going to win any beauty pageants, but it works. Iíll probably slap a voltmeter on somewhere so I know when the 18650ís are tapped, but I have to find one first. Iím sure the $5 unit in Dom post is better in a dozen ways, but this was fun to make and satisfying to see working, so Iím happy.