Cheap replacement bar mount bike light head (Gloworm / Gemini style connector)?

I used to have one of the old Gloworm bike lights that connected to an external battery with the standard DC barrel jack connector. I can't post photos or links to external image hosting sites any more so can't directly link an example but its the standard, non-USB style connector that was prevalent on MTB lights in the past. The light broke a while back but I still have the battery, a barely used one from MTB Batteries.

I was going to buy a new light head from them but they no longer sell them. A lot of the new lights have a different USB interface now. Are there any sellers on AliExpress, eBay etc that still do these types of lights? Any help would be greatly appreciated.