Test/review of Samsung INR21700-40T 4000mAh (Cyan)

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


It’s like with any battery/emitter combo with a FET driver, each combination of parts has to be matched. You can adjust the output by changing batteries, adjusting emitter wireally diameter and length, etc… You basically can add or subtract resistance to control the output.

Are you refering to a xhp70 or 70.2? Are you using 2 batteries so at 6v?

The disadvantage of high current cells is the lower capacity.

I agree with JasonWW. For me the VTC6 is not better than the 30Q. And when you consider actual OEM cell prices, Murata/Sony can lick my bird. Sony is not shy of providing peak temperature cut-off discharge ratings even sacrificing cycle life. Like VTC4's being rated 30A, but they're not 30A continuous. Of course this makes their figures bigger, though this does not make their products necessarily better.

Source: Bench Test Results: Which lasts longer? VTC6, 30Q, or HG2? @ E-CigaretteForum

^:)

70.2 - Single cell there so probably a boost driver. Sorry. FET drivers on 3 volt LEDs like XPL-HI. Can a high drain unprotected battery be used in both scenarios?

Boost drivers have regulated outputs, so you want the lowest resistance possible. Such as bypassed springs and high drain cells. Depending on the load the boost driver puts on the battery, you can sometimes have too much of a good thing and loose run time.

If you look at this review you can see a light that draws 15 amps. A high drain 30T allows for many full power turbo runs, but capacity is small. A high capacity 5100mah cell only allowed one full power turbo runs, but had much longer running time at lower levels.

Here is more data on the same high powered boost driver light with different 21700 batteries.

What I said earlier still applies to FET drivers. You have to take it on a case by case basis. You would need to be more specific about which lights.

JasonWW - Thank you! Needed to know if I should be sourcing multiple types of 21700. The answer is yes. I will read those threads after work. Appreciate it.

You can mainly read post #1 in each about the batteries.

So far there seems to be 3 main types of 21700. The high drain like the 30T, the high capacity like the 50E and the middle like the 40T.

Someone like DB Custom has tried the 30T with all kinds of emitters with FET drivers. He’s a good person to ask if a specific emitter is going to handle a high drain cell.

Love them (Vaping and flashlights)

Bought two (subpar) Samsung 40T from imrbatteries.com:

Samsung 40T battery #1:
Charge test (Opus BT-C100): 3511 mAh discharged at 0.5A
Internal resistance (Opus BT-C100): 106
Charge at 1.0A (Xtar VC4): 3566 mAh

Samsung 40T battery #2:
Charge test (Opus BT-C100): 3691 mAh discharged at 0.5A
Internal resistance (Opus BT-C100): 88
Charge at 1.0A (Xtar VC4): 3883 mAh

Also bought two (subpar) Samsung 50E in the same order:

Samsung 50E battery #1:
Charge test (Opus BT-C100): 4472 mAh discharged at 0.5A
Internal resistance (Opus BT-C100): 96
Charge at 1.0A (Xtar VC4): 4698 mAh

Samsung 50E battery #2:
Charge test (Opus BT-C100): 4427 mAh discharged at 0.5A
Internal resistance (Opus BT-C100): 93
Charge at 1.0A (Xtar VC4): 4650 mAh

I’ve emailed them the test results but have not heard back. Suffice to say, I won’t be buying from them again.

Let IMR know right away so they can check their stock. If counterfeits came in, I’m sure they don’t want any more to be sold, etc…

Barkuti……

I totally agree with you

A manufacturer, MANUFACTURING something to have some performance.
This is determined by some limits set by a manufacturer.
If I exceed these limits, then we are not talking about yield that exactly matches the construction.
We are talking about off-limits.

If it is possible or not to operate outside the boundaries of a construction, it is something else.

- My car can reach 200klm / h - 6300rpm.
On the downhill will reach the … 300klm / h - 10000rpm.
But at some point the engine from high pressure …. will break …… -

This means that an engine has some tolerances.

If Mooch or any Mooch states that such a construction has such a performance, it simply tells his opinion.

My opinion is different about why something was being fabricated and what performance this construction took.

Personally, I will read Henrik’s opinion, because Henrik’s temperatures are the same or very close to manufacturers’ statements.

The differences between batteries today are small.
If I get from a battery 3.5 Volts, and from another battery 3.45 - 3.48 Volts, I think I will want to fool myself because I like the …… brand.

I think it’s right to compare the overall performance of a battery, resulting in …
force
duration
life
as an overall combinational image
Not just based on how many Amps it was able to perform on a discharge.

Clear only my opinion ……

I purchased 5 LR2170SF at 18650batterystore.com after reading Mooch’s review saying it is the best high capacity 21700 to date outperforming the LG M50 and Samsung 50E and 50E2

Here are my capacity measurements:

Cell 1: 4,782 mah
Cell 2: 4,714 mah
Cell 3: 4,698 mah
Cell 4: 4,524 and 4,566 mah (measured twice)
Cell 5: 4,834 and 4,870 mah (measured twice)

They are only being sold for a super bargain $5.99 right now. I also tested them in the Fireflies E07 and the LR2170SF outputs higher than the Samsung 50E and LG M50. Get them before they sell out or price increase!

With which “charger/discharger/analyzer” did you perform the Lishen LR2170SF cell test capacity measurements? SkyRC MC3000?

Maybe he used a constant current load?

I’m not sure, I have a strange presentiment, let him answer thank you, if I’m right I explain why I asked my question this way and you’ll understand quickly …

Same thing for me :slight_smile:

Xtar Dragon VP4 Plus