For some reason I am fascinated by Lumedyne and I look at the listing on eBay. The problem seems to be finding or making the right batteries. I am not exactly handy but there seems to be some battery online company selling 3rd party batteries so as to re-cell. Is there any clear cook book doc to do such? I can't find any. I see many listings have the bulb and the pack but the battery is either missing or just bad. I know it's year 2021.