The lamp is made so that you don't need to use any screws or glue, the only thing you need to glue is a USB connector that only requires a few drops of hot glue. You can fit two 18650 batteries inside, you also need a usb charger board plus boost converter, don't forget to use a USB charger with 1s BMS. I use a 24V LED strip, it depends on what kind of boost converter you have. My output power is 0.84W, if I use 2 times 2500mAh batteries, it can light for two whole days. The bottom of the light has a large screw in it that you can push a screw into, it's there as a service hole in case of emergency. I'm also adding a model of the top part without a hole for the switch if someone has a different type of switch than me