I note that the new Wurkkos DL46 diving light is listed as using a dedicated 46950 battery pack with integral USB C charging port and claims a maximum output of 20,000 Lumens. I hate to think what the initial current at turn-on is at 4.2V or lower.
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Sorry for my VERY late reply!
Maybe I interpret it you wrong, but as you state it, I assume that you meant that the 46950 battery (not pack, it’s a single cell), has a intergral USB-C charging port.
From what I can tell on the image below (from Wurkkos their website) is that the charging port/implementation is part of the flashlights construction and therefore seperate from the 46950 itself:
Max. 18W in is a pretty low charging current for a 46950, which can handle way higher charging rates. Charging an empty battery will therefore take quite a while I expect.
In which way do you mean that?
46650’s can handle a seriously high discharge current. I’m not sure where Wurkkos source their 46950’s, but if you take the Liitokala/EVE 4695E discussed here in this topic, it has a maximum discharge current of 4C (so 120 amps), which I don’t expect the DL46 to come close to. Combine that with it being a diving light, which will also help to keep the light/body tube cooler and I don’t expect the 20000lm (at turn on) to be a real big problem for the 46950.
I’ve also shared the build on reddit but then I found out this BIG topic here on BLF.
So, I’m playing with this host recently: DDH-D6E/46950 tube, cost 168 RMB on taobao.
It was fitted with a 47mm XBY v2.2b FET driver capable of huge output, with USB charging and powerbank capabilities.
After a bit of exchange with the driver producer, he kindly provided a beta version of his latest Regulated +FET driver, XBY v3.0b for me to test! Out with the old, in with the new, in less than a month 
It does regulated 0.5A to 20A ramping or 6-stepped output. And on turbo,
it’s capable of pumping over 65A through the SPF55, that really put a smile on my face 
The producer claimed that it’s capable of 100A of current if SFY55 or NDB160 is used, which is overwhelming imo, but impressive of course.
For now, it serves well as my daily powerbank to carry around.
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Awesome. Like a scaled up Nightwatch NI03S. Did you get any performance data like for output etc?I’d be interested to see if this would be an alternative to Nightwatch, which hasn’t been investing much in interesting lights lately.
I don’t have any instruments for proper figures so, I went for some beamshots.
The first photo is..(you guess it 
) the D6E SFP55, full blast. The second photo for comparison is a M21C XHP70.3Hi 4000k “N4”, 6v8A turbo, taken earlier this year.
Camera set to 1/15s and ISO 3200.
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Where did you get the regulated version of this driver?
Was it the *Winter Melon optolectronics" (thanks google translate) store on Taobao and you just asked the guy?
I kinda like that translation but no, not from winter melon.
The driver producer himself is not on taobao, he only list on another platform called goofish.
The platform is rather unfriendly to people outside mainland China. Even I, a Hongkonger, found it a pain to deal with…
The regulated 47mm driver is not open for sale, yet.
I originally bought the 47mm FET version(the purple one)(through some hardship) which was the only version available, alongside a 32mm one. We talked and he asked for some feedback on the driver. I told him “a regulated version would really be appreciated.” and he happened to have a regulated 47mm design in the pipeline, that ends up in my d6e now. Hopefully he’ll produce a refined version for sale very soon.
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Thanks for the additional info.
Have to then just bide my time then for now - really do hope that that regulated version eventually makes its way to to the usual “accessible” outlets…
THE 47mm 20A regulated output would be an ideal replacment 3V driver for the venerable BLF GT host, plus I’d kinda want to make a tinkered “searchlight” -style build using the DDH C8 housing as a base…
I am looking for a decent 46950.
On Aliexpress I found the Liitokala ones (very expensive with around 30 EUR each), and cheaper ones called “Varicore” for around 20 EUR each - are these decent?
They’re fine. Most of these cells are just rewrapped EVE 30Ah 46950s or 31.8Ah 46950s.
Are you able to tell me what cell “Varicore” likely uses?
Since both cells are sold in bulk at similar prices, I wouldn’t know.
I’d assume a lower grade of either one they were able to get for cheaper.
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I’m pretty sure Varicore also uses EVE 46950 cells; visually they exactly match how the EVE ones look/are constructed. Besides that, I’ve also seen plenty of photos of them on Aliexpress, on which they have a protective clear plastic cap on top (for transport) with the EVE logo embossed in them. This is exactly the same on the Liitokala 46950/4695E, of which I’m 99% sure they are (also) EVE cells.
Currently I have 7 of those Liitokala 46950’s (bought at 2 different moments) and from what I could tell, all of them are original.
I just took a look on Aliexpress, but the Liitokala ones are currently really expensive and not a single good deal I could find at the moment!
The reason that I have 7 of them, which I don’t have a need for, is that at one point I came across a REALLY good offer on Aliexpress, which I couldn’t believe I really would get them for; first I ordered a single one which costed € 10,38 (including shipping), but then I became curious how cheap I could get them. In the end, with the listed price when ordering 5 pcs and stacking several coupon and coin discounts, I got the price down to € 7,10 each. (Price for 5 including shipping cost was € 35,53.)
I’ve never seen an offer for 46950’s on AE again, that was this good/low!