I’d love something that would be able to do 50watts.. I still need to buy a battery holder for it.. so far didn’t have the need yet..
I do have the Atorch holder that the 46950 fits in.
Do you mean a full discharge test with a constant power of 50 watts? Assuming that I set the cut off voltage at 2,7V, that would mean ~ 18,5A discharge current at that point, so just within the limit of the DL24.
Starting with the battery at 4.2V, that would mean 11,9A but if I would do a CC discharge at that, then the discharge power at 2,7V would only be ~32V at that point.
50 watts charging. Most chargers do it at about 20 watts now.. which is not fast enough for a 20,000mAh+ battery
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I’m experimenting with some new “charging systems” from Aliexpress of which I ordered a bunch of recently, but with my limited technical knowledge and limited spare time, it might take a while to go through the several options to see if there are some options than there are available now!
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Since I saw your comment I went ahead and ordered a 49650 battery adapter to connect to my RC charger 
Not sure if it was a good deal, but I paid like $20 for a battery holder.
By all means, share your results. Looking forward to hearing more about it.
Which one did you order?
I recently purchased a second Atorch one (link below), which I’m planning to convert/use as a battery holder purely to charge 46950 batteries. I already have one for my Atorch DL24 electronic load/battery tester, but I want to keep that one intact for that specific purpose.
I’m still waiting for that holder to arrive (shipping is slow with this one), but hopefully I will be able to start testing some of the “charging modules” as soon as possible.
I will obviously post it in this topic when I find a module that might work!
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This is the one I ordered: https://www.aliexpress.us/item/3256806907999195.html
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@Wingman I received it today.. it’s a bit bigger than I anticipated
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I had spotted that one also (and added it to my cart), but since I already had ordered that Atorch one, which still hasn’t arrived 
, it probably will remain in my cart on AE for a while. (But I might eventually order it, who knows.)
Besides the possible cheap(er) charger options I’m going to test, I’ve also spotted this type of charger on AE:
It is a bit more expensive, but given that you can adjust the Voltage (between 3-15V) and charging current, it does appear to be a very powerfull charger.
And it does charge CC-CV, which should also make it suited to charge Li-ion batteries.
I recently used my cheap bench power supply (30V/10A) to test charge a 21700 (at a lower Amp number) and it nicely charged it also CC-CV, but lowered the current nicely during the end of the charge, when the battery was approaching 4,2V and terminated charging at the set 4,20V.
So I should at least be able to charge my 46950’s at 10A, which is already a considerable improvement compared to my current charging options.
The easiest and simplest answer would be to use decent sized wires, clamp or solder alligator clips onto the ends, and use magnets to attach them to the battery and charger terminals.
FireFlyLite sells a universal battery charger that is a more refined version of the method above. I bought it for my 26800 batteries. I got it for around $10 iirc. I actually just keep it in the glovebox.
I wanted to charge two 26800s at once. I also have like 4 different chargers. three or four 2-bays of varying quality, one 4-bay, and one 8-bay. none of them were long enough. one of the Xtar (?) 2-bays was very close, so I dremeled and sanded the plastic away from the negative spring-loaded contacts just enough to get the battery to fit.
Convoy’s 26800 batteries are recycled from EV packs, and as such still have a piece of nickel(?) strip welded to the battery terminals, and as such are maybe around 1mm longer than other 26800s. I don’t have any other brand. I use the modified charger to charge my convoy L7’s 26800s. this charger also acts as a battery pack if you want it to. it’s my only charger that can select charging current, from 0.5-2A. unfortunately 2A can only be used with a single battery at a time, so I am in the market for a charger that will fit them without modifications.
I imagine with how much bigger your battery is that you will not find a bay style charger that’ll work, likely requiring the wire method.
With the only problem that the positive terminal of the 46950’s that I’ve got so far, the Liitokala/EVE 4695E and the Lumintop 46950 have (aluminium?!) non-magnetic positive terminals, so a magnet doesn’t work. I found that out the ‘hard way’ since I thought I had the perfect magnets (with internal pogo terminals for conducting power) to make my own wires.
What is the max amps it can charge a single battery with?
With the fact that a 46950 is (up to) 32.000mAh, it needs to be substantially higher than 2-3 or even 4 amps, since charging it with that speed takes ages. Besides that: 46950 can handle way more charging current that. Up to 1C (so 30/32A) should be possible, but I would say that 10A would be a good starting point.
Currently I have 2 Lumintop Aurora powerbank housings, which both reach ~21 watts while charging (obviously with some conversion losses), which should (at least) give something like 4A charging, but with a 32Ah capacity, it still takes a very long time.
I recently also purchased this 46950 powerbank housing to try out:
It outputs 22,5 watt, charging is limited to 18 watts, so slightly below that of the Lumintop Aurora, but should still be (well) above 3A.
Build quality is pretty decent, with a light (but sturdy enough) aluminium housing/casing and charging/discharging seems to behave quite well, although it does stop discharging at a bit too high voltage in my opinion (3,3-3,4V if I remember correctly), but the Lumintop also does something similar.
What I do like about this powerbank housing, and what the Lumintop Aurora doesn’t do, is that by press (and holding) the left button, it also shows the battery voltage.
the only thing I can think of off the top of my head for the magnet situation would possibly be to hold the leads onto the battery with a thick rubber band like a “ranger band” or possibly the grocery store produce ones?
to be honest I completely forgot that your battery would need more powerful charging cause it is so large. the FF charger takes over an hour to charge a convoy EV pack 26800, maybe closer to two hours, so it’d probably be a no-go.
and y’know leaving Li-Ion batteries out to charge overnight or whatever is a terrible idea imo. the one you linked does seem interesting. especially showing the battery voltage, all of my regular chargers just have up to four lights to show charge (they’re all older). I would imagine that the charger/powerbank goes off of batt voltage to decide when to stop charging - around 4.2V?
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I bought the RC charger and this charge bay to be able to charge above 20 watts.. At 20 watts, charging still takes 8 hours.
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Hold the wires on the battery with rubber bands. If the battery gets too hot the rubber bands will melt and break the connection.
I agree; I never leave Li-ion batteries (or appliances with a build in Lithium battery) charge overnight.
Both 46950 powerbank housings (Lumintop Aurora and the generic one) show the battery status in percentage, but that is a bit relative, since they both show 0% (and turn off) at a bit too high voltage in my opinion, leaving a (little) bit of useful battery capacity unused.
The 2 Lumintop aurora powerbanks both stop charging at almost exactly 4,20V (measured with several digital multimeters afterwards), which is surprisingly accurate. The ‘generic’ powerbank terminates charging a bit early (4,15V if I remember correctly), but I prefer a tiny bit of undercharging than overcharging and at that last 0,05V of an almost full Li-ion battery is only a tiny bit of capacity.
That generic powerbank shows the battery voltage in 2 digits, so 4,1V for example and is ‘accurate enough’ for a quick indication. I expect that it uses a different chip for displaying that voltage number and that the voltage reading to determine charging termination is done by the charging/powerbank IC.
In regards to the “budget chargers” I’ve bought on Aliexpress to test; I will look up the link for what might be the most interesting one and post the link to it here. And soon as I’m able to properly test it I will obviously post my findings here.