Lightest USB rechargeable 18650 flashlight? (For bicycle helmet use)

I find 18650 flashlights ideal as helmet lights, currently using the 50 gram Olight S2 and it's working well, but the S2R would be more practical to recharge, only it's a whopping 50 grams heavier - so I'm wondering if there are any other lightweight usb rechargeable options.

I've found the Thunite TC12 V2 85 grams, build quality doesn't seem as good as the S2R and recharge port placement/system not ideal, but it could work. Any other contenders? Can also be horizontal mount.




Imalent HR20

JETBeam EC-R26

I was going to mention the R26. Mine comes in at 57g, excluding battery.

Thanks, the JETBEAM EC-R26 @ 55g unfortunately doesn't have a usable high/medium mode at around 400-500 lumen ideal for biking.

The Imalent HR20 at 45 grams is really interesting, inf. adjustable brightness is sweet, and 24 eur from gearbest right now. Going to give it a shot!

When you put it on turbo, after about 1 minute it’s going to drop down to 400-500 lm.

That’s nice, until you realize you never really know at what level you are, which makes estimating battery runtime impossible.

Good to know, but not ideal.

http://eagletac.com/html/dx30lc2r/specs.html

I don’t see how the S2R could be 50g heavier than te S2…
I’ll check this when I’m coming back home for sure !

One thing's for sure, the Imalent HR20 is a POS. Wobbly dial, the usb cover fell out by itself, usb charging not working at all.

Forgetting about USB charging and getting the Skilhunt H03R instead (the new Zebralight v4 would be top of the smallest, lightest and best pic, but it's 2x the price and brown).

S2R is only 6g heavier than S2.

I have had very good luck with this headlamp. I’t’s very light! control is perfect. Quality is very good for $8-$12.
You have to take the battery out to charge but who of us doesnt have chargers everywhere?!?

https://www.gearbest.com/headlights/pp_294544.html