You scored, guy! Plop-in a couple protected rechargeable LI-ion cells from https://www.jsburlys.com/shop/ and it will best an L4!!!! The 5W will be overdriven on the Li-ions and I've seen one report of failure, but SF's warranty is "gold."
Unfortunately this is not what I am looking for. I needed something simple with around 30 lum of light. It would be a killer light for me with 500ma upconverter.