Wouldn’t you like to have a flashlight that does not need batteries that will last a lifetime? Wouldn’t it be great if you didn’t have to shake it every few minutes to keep it lit up? Then what you need is a super capacitor flashlight.
You will need to buy a pen light (you will need the LED driver board inside the pen light). I got mine at Walmart for $3.50. The part number is BRSLEDPEN-BA.
Or get one here (google shopping search):
The pen light is easy to take apart. The gray plastic part with the lens unscrews. Pull off the black ring. Pull the board out of the white plastic tube. The black wire on the board will be connected to a metal contact on the side of the white tube. Cut the wire at that contact.