I have an Astrolux EC03 that is winging its way to me from Banggood, so I recently bought another Samsung 40T locally . This battery appears to be about 1mm longer than my other one and has a ring on the negative terminal (see pic). On the top of the can, through he wrap, I can see a code:
M011
41711
Do you think that this the genuine article or a rewrapped fake? I want my full 6700 lumens out of the EC03!
can you show some pics
Can you measure the diameter of your 40T?
If you have a Convoy S21A or Convoy M21A, a genuine Samsung 40T will fit them. But some nongenuine 40T seems to be rewrapped “Lishen 21700 with the bottom ring” and won’t fit the S21A or M21A.
(Although there could be other non-genuine-Samsung 21700 that may also have a similar narrow diameter)
Your 40T also has very well-aligned lettering. In my limited experience with genuine Samsung 21700, the letter markings usually are not “too” well-aligned.
~
I’ve encountered a couple of non-genuine 40T (not from Banggood though, since BG does NOT ship batteries to my country), both of the non-genuine 40T seems to perform more like a Liitokala Lii-40A (correct ~4000mAh capacity) but different dimensions (diameter) and AC IR test.
(yours may not be the same “non-genuine” 40)
I have some coming from BG so this thread is very interesting, thanks for this
i noticed chinese 21700 cells run to the fat side of spec.
just got a bunch of sunpower that are 21.7mm.
in all fairness they have no part number.
they are close to 21700.
they are pulled from a huge lot of replacement dyson packs that were made with the wrong plastics.
pushing the dimensions a bit to gain capacity is nothing new.
NKON had refurbished 40T cells for sale in a clear wrap. I never caught them on selling fake cells.
So it isn’t always a cyan wrapped cell?
Interesting. Got to check this one before buying.
I don’t know if this is genuine.
Dammit, my Samsung 40T’s I bought locally match up exactly to the fakes in your post, about 21.7mm, non recessed top ext…they look and measure up just like the fakes you posted! Thanks for the good info, I’d have never known.
The “consolation” is that the non-genuine 40T I tested (pictured above) also have correct capacity (around 4000mAh), just not they are not as high-drain as the genuine 40T (won’t be as powerful when used in the more high-powered flashlights).
The non-genuine 40T I tested, seemed to perform about the same as Liitokala Lii-40A 4000mAh 21700…
which is a lishen lr2170sa.
a decent low-mid drain cell.
likely what is used in many fakes/rewraps.
not as many mfrs of the 21700 yet.
The authenticity of a battery is really not ambiguous. If you lookup the manufacturer spec sheet, it will tell you (among other things) the exact width , length and internal resistance.