Downsizing, so found an old rechargeable bike light I had. I had upgrated after the battery stopped charging and could not get spare parts in the UK. This is an Aussie company that made these but they are no longer selling parts for their older models. When it worked it lit up like the photo. Essentially it's a torch, which splits in half at the base of the head, and the body is a Li-Ion battery that gives a stated run time of 2hrs on high beam. I have also added a photo of what I think are the battery specs. More specs here https://www.mtbr.com/threads/niteflux-photon-4-commuter-and-enduro-review.1...
I would hate to throw it away, so if anyone is a proficient DIYer can have a go at fixing and using it. The batteries are not expensive, but it will be a DIY project.
In this forum there is a few ideas of how to open the battery casing and replace the battery with a DIY alternative.
https://www.mtbr.com/threads/disassembling-niteflux-photon-max-battery.653436/
And someone else had suggested:
HR-4/3AU SALE
WITH Solder Tabs
Limited Supply Sanyo Ni-MH 4000 55 $ 4.00 Buy
http://www.batterystation.com/nicads.htm
Or a li-ion battery with waterproof coating rubber 148v 2200mah tech female plug maybe?
https://www.batteryspace.com/Custom-Lithium-Ion/Lipo-Batteries.aspx

DIY Project: Niteflux Visionstick Photon 4 [battery is dead] (Bedwell SG1)