I'm 69 and make these fast charge port lights and I sell them on Etsy. I make them to be sturdy and to last. Check out trickitout.etsy.comView attachment 23076
Actually, the battery is to test the light before installing and at a mid point. The light is designed to be hard wired in and function just like the OME Light. Video and written/illustrations instructions are viewable at trickitout.us.