I have new instructions and a new LED Hoop Rechargeable Upgrade Kit that is easier than the first I wrote about.
This time the DC jack snaps right into a through hole on the outer diameter of the hoop between the switch and connector.
You only need to make a 3/8″ hole for it in your tube. You’ll still probably want to solder the wires to the jack but it is pretty straight forward.
Light Time : 3-5 hours
Charge time: ~ 1 hour