VapCell 26650 K62 6200mah 15A/25A Li lon Battery High Capacity 3.6V

Commercial Sellers' Spot
21

Emisar D4SV2, Convoy M3-C, S11, L range, Sofirn SP33S. Plenty of good 26650 lights.

22

My D4SV2 and M3-C are now exclusively 26800 lights :nerd_face:

23

Thrunite Catapult V6 and Lumintop ODL20C V2 also new 26650 releases. Looks like Lumintop went with 26800 for the new D3, though.

26800 is where it’s at for fat cells. It offers more than any 26650, still, although it sounds like this new 26650 may be a great general purpose choice with more capacity for replacing cells or in lights that can’t (or don’t wanna be) upgraded with longer tubes or adapters. For new lights, it makes the most sense to go with 21700 or 26800 though. In the nonflashlight world there are still plenty of devices that were designed for 26650 (and cheapie flashlights, too) so they’ll need good cells as well.

24

But those lights come with their own branded 26650 cells. I do wish there is a 7000mah 26650 with 20A. Then I would be all for 26650 flashlights.

25

26650 batteries with 6800mah 10A can be made. The unit price will be very expensive and the market will be very limited

It is expected to exceed the wholesale unit price of $7

Developed by Samsung and molicel, it is estimated that it can do 7000mah 20A

I don’t expect to wait for it in my life :slight_smile:

26

10A won’t cut it. That won’t be enough to motivate flashlight manufacturers to hop back on to 26650

27

Can I use them in my Convoy L6 ?

28

@puglife2, you absolutely god damn can for maximum capacity!

:smiley:

29

If you can find them. I checked yesterday and they don’t have them listed on their web site anymore…

30

Here you are.

31

Thanks. I was looking at their web page as linked in the OP.
One would think that they should have them…
Anyway, thanks for the link!

32

I would like to report having self-discharge and overdischarge issue with possibly some Vapcell K62 26650 batteries, based on my purchase of 8 pieces of them.

I purchased 8 pieces of these Vapcell K62 2600mAh 26650 from a local reseller.
All of them arrived properly sealed/shrink-wrapped.

I tested the voltage of all of them.

  1. 4 pieces arrived at around 3.77-3.78v
  2. 2 pieces arrived at around 3.66v
  3. 1 piece arrived at 1.10v <= OVER DISCHARGED
  4. 1 piece arrived at 0.79v <= OVER DISCHARGED




!https://i.imgur.com/GNAxnyP.jpg ! !https://i.imgur.com/44wc4Ax.jpg !

I reported the discharged batteries to the local reseller, and the local reseller asked if I can use reactivation charger to charge the 2 pieces over-discharged batteries.
I was able to charge the 2 over-discharged Vapcell K62 (monitoring the batteries temperature when they were nearly fully charged)

(For the 6 pieces batteries (3.78v and 3.66v), I left them as is and did not try to charge them yet — I plan to observe if their voltages may continue to drop.)

Now for the 2 pieces, after I “reactivated” the over-discharged batteries, I did a round of capacity testing (charge to 4.20v, discharge at 1Amp to 2.50v), and the results are 6208mAh and 6057mAh

After finish charging, I did not use the batteries but left them unused on the table at room temperature (room temperature here is probably around 30 degrees Celsius)

very fast self discharge for one of the over-discharged batteries:

  • tested voltage (a few hours after charging) … 4.125v
  • 32 hours later … 3.849v
  • another 14 hours later … 3.66v

from 4.12v self-discharge to 3.66v in around 2 days.

~

for the other over-discharged battery, it appeared to be a bit better:

  • a few hours after charging … 4.170v
  • 32 hours later … 4.159v
  • another 17 hours later … 4.151v

(I think this may still be considered normal? will observe a few more days)

1 Thank
33

Both Sony and Samsung have literature which says: below 1.0V, do not recharge. (lithium ion chemistries)

Cells which self discharge like this are bad cells. Some companies do charge / rest / test cycles and discard the ones with high self discharge rates because those are bad. Apparently Vapcell’s supplier is not doing this.

The voltage settling to ~4.15V is normal.

34

I was thinking of getting a few of these, but will probably change my mind.

35

This matches my experience as well. Out of 3 cells received, only one seems to have stabilized in voltage at around 4.14v. The other two are self discharging at varying degrees. Only one has been used in an actual load, and that on falls under 4v within a week of sitting on the shelf in a well air conditioned room. I will update this with current voltage drops shortly.

Edit: big shout out to 18650batterystore here. I reported the issue to them and they sent me 2 replacement cells for the one defective cell I reported. One of these cells shows high self discharge, although lower than the first cell, and the other seems to be ok.

Edit 2:

Cell 1 - the “bad” cell:

8/09/2022 - 4.136v

8/22/2022 - 3.388v

Cell 2 - replacement cell (capacity tested at 5943mAh on an xtar VC8):

08/19/2022 - 4.149v

08/22/2022 - 4.104v

Cell 3 - replacement cell (the “good” cell):

8/09/2022 - 4.148v

8/22/2022 - 4.140v

36

Hi, Jon here from Liion Wholesale. We tested the rest of our stock and found 5/91 to be below 1V. The rest were within 0.02V of when we last quality tested them in June. So it seems there is a small percentage that have excessive self discharge (and they were all next to each other in the box) but the rest are completely fine.

I’m not sure if we’ll reorder these but at least for the moment the rest of our stock should be good to go.

37

Old thread, but I wanted to report that after about a year’s worth of use and ~80 cycles, 8 of the 12 K62s I have developed high self discharge and high IR. Cells now take 7+ hours to charge at 2A and will discharge down to 3.5v in about 24-36 hours.

I’m disposing of the entire dozen at a recycling center and replacing them with G53s which have held up great.

(For reference, some are from LiionWholesale and some are from Illumn.)

38

For me, even these are too low of capacity. If we went by volume, and if these could be made with the same cell material as the 6000 MAH 21700, They would be 8500 MAH. That makes it worth going up to this size.

From what I understand, there are just big sheets of cell material that is rolled up tightly and stuck inside of a metal can. So the same stuff that makes one cell should be able to be put into this bigger can, and have more capacity and current capability.

Still, It is nice to see improvements being made. Also from what I understand, vapcell doesn’t make cells. They buy bulk from Sony, Samsung, lg, lishen, Ect. And wrap and market them. Which is great it’s a good service and I’m glad they exist. I have some of their cells myself. But being that they are not a manufacturer, it’s not like we can ask them to make something better. And the reason why there are no high capacity 26650 cells, is because there’s no point making them. I, the big manufacturers need to make 1 millions of these things to make setting up a production line profitable for it. And nothing uses this cell size but us weirdos. Tool batteries used to, but I imagine they’ve gone over to 21700 now

1 Thank
39

I agree, I have a light with 26650, and with 7000-8000 mAh it would be amazing (due to powerbank feature), but with my current 5500 mAh cell, or even the here posted 6200 mAh cell I’d rather have a 5mm thinner tube and the same capacity in the form of a quality 21700. 26650 adds a lot of thickness to a flashlight - in return, the cells gotta have a lot of capacity or it is just not worth it over 21700.

2 Thanks