I think you mean 50G is for EV use.
Okay, since I think most electric vehicles only charge their cells up to around four volts (for longer life and faster recharges) maybe they optimized the chemistry just for that application = Longer life and more charge/recharge cycles at 4v or less.
IDK, I’m just guessing here. Then the 50E is the consumer or general purpose version.
I have no idea. I’m still waiting on my first 21700 flashlight. Lol
Yep there were some sales on 18650batterystore.com and there’s also free shipping when I buy over $100 so I thought might as well. Also I think VTC6 is better than the 30Q based on HKJ’s comparator. VTC6 also has more capacity.
Nobody else has any theory or assumptions, I accept even the craziest ideas? lol … I’ll give the answer in a few hours, by then, good luck. A clue: Myself, when I was looking for this answer a few months ago, I was building extravagant theories when the answer is not that complicated at first sight.
Why are the Samsung 21700 cells so expensive? Samsung 40T goes for like $20 on imrbatteries.
It’s fresh on the market, so supply is low and demand is high.
The 30T has come down to about $14 and the 48G down to $9. Give it a few months and the 40T will be more common and the price will drop.
Samsung 30T is $12.99
If you want to buy the 40T, I recommend you get the VTC6A, which Mooch rates at 30A continuous. It should be at least as good as the 40T if not better. Currently on sale for $13.99
https://www.18650batterystore.com/21700-p/qso-21700-4000mah-vtc6a.htm
The difference is 2 years.
Yes, you are on the right track, but more precisely? (because your answer is a very good clue to find the right answer to my question)
Not sure what do you mean. One cell is 2 years older than the other. Which suggest that one is an older model than the other.
Designation 40S suggests lower discharge rate than 40T. Which may be due to internal improvements. Or may be due to other factors.
My guess is that 40S is just older and technically worse cell.
But maybe you meant something else?
Well, because you’re really close to the right answer, and if I keep telling you that it’s not exactly that, there’s a risk of both going around the answer for a very long time moment, so I give you the right answer.
The 40S is the starting denomination of the 40T, because during its design and as you said before its chemistry and its internal settings were slightly different, which after multiple tests on the part of Samsung SDI engineers was resulted in a significant improvement in its discharge capacity and internal resistance, which pushed them in the end renamed the INR21700-40S to INR21700-40T, so to sum up the 40S is the pre-release of the 40T.
P.S .: Thanks to the Vapcell Technical Manager for enlightening me on this subject.
Thanks for the response. I just checked and the price for the VTC6A is $16.99. I guess I missed the sale price… I guess I’ll wait for the prices to go down a little but I ordered one of the sofirn 21700 lights and need a cell for it. I guess I can use a 20700 or 18650 with a sleeve for now.
Sofirns battery is only $5.50 extra so it’s worth getting.
Another inexpensive 21700 is the Liitokala lii-40A. It’s based on the Lishen which is proven to be a good high drain cell.
Thanks I’ll look at those cells too.
It’s depending on how the cell is used, in which flashlight. I did try several 21700 cells (LG M50, Samsung 50E, 48G, 40T, 30T, Sony VTC6A, LiShen LR2170SA, LR2170SF) on two versions of ACEBEAM EC65 (XHP35 HI and Nichia).
With sufficient cooling, I activated the Turbo again and again, until the cell voltage was too low to sustain that brightness level. And the results are:
For both EC65, the 40T was slightly better than VTC6A. And the AC 1khz IR was also smaller on a 40T.
For a XHP35 HI EC65 (high demanding), 40T provided the longest Turbo.
For a Nichia EC65 (not that high demanding), LR2170SF provided the longest Turbo. This is surprising but yet reasonable, since the characteristics of this cell are between 40T and 50E.
Since some of these cells are not that easy to find, and I cannot assure you that my samples are consistent with what you can buy, you’d better take these results as reference only.
Is there any information if the 40T cell is being sold by other brands as a "rewrap"? I'm looking for a (European) source to get some of them. Concerning the Samsung 40T, NKON needs a couple of weeks until stock gets replenished and akkuteile.de is out of stock and wants a fortune for this battery.
Check out the Vapcell INR 21700 4000mAh 30A with gold wrapper. This is supposed to be a 40T, buy it looks like NKON is out of stock of that as well.
They do have the Ijoy 3750mah. That’s a good cell.
Sony 21700 VTC6A
vs
Samsung 21700 40T
The batteries have the same discharge performance.
If you call “difference” the 0.05 volts, then you are looking for a pin in the straw
With a FET driver will an unprotected cell at 20a - 50a rating just fry a single XHP70? I am trying to understand all the underlying factors here. I want to get a decent stock of 21700 batteries and be able to use them in all my various lights utilizing that size going forward. Do I have to be careful with this? I like using turbo mode some but am worried about frying emitters I might not be able to easily replace. Higher capacity with lower discharge rate seems the safest route overall, but what is the disadvantage of using hi current cells. I rarely run a light until drained. For backpacking runtime is most important at mid light levels. For around the home or shop, topping off a light on a charger isn’t an issue.
Does your VTC6A have a small square QR code at the bottom? Mooch said the ones without the QR code performs slightly worst