Sofirn’s 21700 batteries are now from Lishen which aren’t half bad.
The 26650’s are excellent being from PLB who were used by Shocli.
14500’s are questionable and I’ve received many in the past with rust under the wrap. Reported to Sofirn and was ignored. I purchased in bulk 200+
Not sure what the 18650’s are, but tested okay. No idea on how they age though
Sofirn’s 14500 cells with rust
Very interesting.
I try to stick to name brand, My 18650s are Sanyo and Samsung. If i replace them (they are getting close to 10 years old) and get some 21700s as well i plan to go with name brand again. The HF thread is more worrying then the explosion risk.
BTW I actually like your posts becasue as a business you have a lot of experiences none of the rest of us have.
Which reminds me you had mentioned in another thread that Convoy are certified lights, what certification do they have?
Also i noticed CE and ROHS on my new Wurkkos WK30, was surprised to see that.
The brands I sell that have CE, ROHS certs are (I don’t sell anything else yet)
Sofirn
Not the D25S, D25L, S11C since they aren’t made by Sofirn
Wurkkos (Sofirn build them)
Convoy
Guess what, I just found out Astrolux/Mateminco refuse to carry out any testing anymore. I’m ditching the brand. They print CE, ROHS on the flashlights, but have no such testing done at all. I would strongly suggest not buying them IF your country requires these certs for your insurance.
oh and Skilhunt has all the safety certs. I just have their headlamps
That last requirement is why I stick to eneloop.
I did research on 21700s, and I like these the most:
They're very nice, and fairly cheap, but the wrappers on the cells break easily so you have to be careful not to damage the wrappers.
Good to know
How can you tell if a flashlight is tested and they are not just claiming its certified?
I’m all about capacity so i would want some 5000mAh cells.
You have to ask them for the CE certs or whatever it is you need.
I’ve never seen a certification document for a flashlight. I sold some 8 year old Convoys, i wonder if they had been tested/certified.
How did you figure out that Astrolux/Mateminco refuse to test?
I was a dealer for them and asked for the certs of their new models. Ben, who handles all customer service, said they no longer carry out any testing.
This is slightly concerning that they simply don’t care anymore to make sure their products are safe. Banggood is really their only buyer for the Astrolux brand, so there’s no need in their eyes. If they had a large number of dealers worldwide it would be different.
Every single Convoy model has the CE testing done. They do things properly 
Make sure your light doesn't require high drain cells then. 
Impressive honesty 
Ridiculous business decision :person_facepalming:
Nice! I am curious what is tested, are there any publicly available certificates?
This cell puts out 9.8A.
https://liionwholesale.com/collections/batteries/products/samsung-50e-21700?variant=12667804450910
So 3.6V x 9.8A means 35W. This is good enough for the lights that i’m looking at. As the Convoy M21B i am looking at puts put 1500 lumen i don’t expect any problems. If it takes over 35W to do that then there is a bigger problem at hand.
That said you have inspired me to look up its wattage vs output graph
That’s not how you choose a battery though. You need to understand that most drivers rely on a battery’s voltage for outputting the highest possible lumens. When you apply 9.8A on the Samsung 50E the voltage will sag on load thus reducing the lumens.
In my opinion, if a torch requires up to 10A I’ll recommend a 15A+ battery. For my Osram 5A builds I’ll bundle a 10A battery, for 10A I’ll bundle a 20A etc. You’ll get longer runtime off a battery if it’s not pushed to its max rating
It seems its run at 6A and is likely a linear driver as its likely a 3V chip
So no problems
https://www.mouser.ca/new/luminus-devices/luminus-sst-40-w-white-leds/
Since i don’t know much about Luminous LED chips and didn’t think look at the one i was considering i appreciate the unintentional nudge
A battery’s capacity rating is measured at 0.2C (0.2 X capacity) discharge current. You’ll get less capacity the higher amp load you run the battery at
A Molicel P42A and Samsung 40T may achieve longer runtime than a 50E
Fair enough, i just replied to RC that it needs 6A out so 9.8A should be reasonable.
Nevermind, I missed that it’s only for the Convoy M21B
Interesting.
I hope you don’t mind if i ask you about that in the future if i do end up buying that light.