Question about new NovSight ebike/bicycle headlight

[niwrad]

After realizing the stock headlight on my bike is actually worth about $10 and somehow the switch broke so it no longer turns on unless I press really hard into the switch. Tried to open it but it's basically hard to do without breaking it, I looked around for lights.

Strangely their website doesn't list it as a product but here is their youtube channel
[youtube]https://www.youtube.com/watch?v=WFSV-Y9-HTc[/youtube]

They have it on amazon and ebay, here is an amazon link
https://www.amazon.com/NOVSIGHT-Powerful-Rechargeable-Bicycle-Headlight/dp/B07P42R4DJ

Even more oddly it has this battery pack that doesn't come with a charger...? I figured I can run it off the main ebike battery but it says it runs a 18650 8.4V battery, which doesn't seem to make sense unless it's a different chemistry that runs 2.1V per cell and I'm not really sure what that is. I'm going to see if I can run it using the DC-DC converter I have that outputs 9V and another one that does 6V to see if it works or not. It's farily affordable given it's specs

 

[amberwolf]

Even more oddly it has this battery pack that doesn't come with a charger...? I figured I can run it off the main ebike battery but it says it runs a 18650 8.4V battery, which doesn't seem to make sense unless it's a different chemistry that runs 2.1V per cell and I'm not really sure what that is.

8.4v is 4.2v x 2, so it's probably a 2sXp battery pack of any of a lot of common Li chemistry cells.

If it doesn't come with a charger...that's kind of a problem they need to fix, or else they'll end up with a bunch of damaged units by customers who have no idea how to charge a battery and just plug various power supplies into it (unless that's what it is designed to do).