this is our new helper for camping,mountain climbing,reading and sailing.it's also very cheap and it costs under a dollar.
Step 1: What Do You Need?
1-1w power led
2-3.7V 350mA li-ion battery
3-li-ion battery charger board(optional)
4-power led lens and holder(5^ or 45^)
5-small on\off switch
Step 2: Hot Glue the Power Led to the Battery
Step 3: Hot Glue the Switch
Step 4: Solder Them All Together
then add the lens and hot glue all the thing together.
Step 5: You're Done!
now you are done and you can test the flashlight as i tested the battery will last about an hour so it's good for the size of it.