Latest release Vapcell 21700 5600mah 12.5A battery

I have kept 3V in my charger (default value), but according to the graph that also wouldn’t make much difference.

BTW, I just repeated what they wrote on the Ali site:
Typical Capacity 800mAh (0.2C discharge)

Notice that the “begin volt” is 4.198V. This is almost impossible to achieve even with cells fresh out of the charger, I assume they must have set the termination beyond 4.2V in order to start the test at such high voltage. Probably around 4.25-4.3V.

With the MC3000 you get an option of “d reduce” which is the equivalent of a reversed CV phase for discharging, maybe with a termination current low enough along with the high starting voltage the 800mAh+ capacity can be achieved.

Well, testing chargers discharge down to 2,8V.

If you want full capacity, you need to go down to 2,5V.

Yeah, but I find it hard to believe that 5-6% of the cell’s capacity remains between 2.8 and 2.5V.

When people say down to 2.5/2.8V do they mean under load or not? No one seems to make the distinction but i’m pretty sure it makes a not insignificant difference depending on the rate.

Under load, I believe.

Finally received the two 16340 cells.
Charged then discharged at 1A to give 810mAh and 827mAh.
4.16 resting voltage after one hour.

Performance comparisons:

Vapcell 16340 800mAh vs AWT 16340 550mAh cell.

.

Vapcell 14500 1000mAh vs Windyfire 14500 650mAh cell.

.

Vapcell 14500 1000mAh vs Windyfire 14500 650mAh cell.

.

Vapcell 16340 800mAh vs AWT 16340 550mAh cell.

Nice testing and graphs :+1: :+1: :+1: , with clear winners.

U took the words from my fingers :wink:
Thanks for the test CRX!
Mine should be arriving next week, and I’m looking forward to use them :wink: Thanks to Vapcell :partying_face:

Cool :THUMBS-UP:
These tests give a better real life usage perspective on performance rather than just testing the cells in a discharge rig.
The results differ in every run due to temperature etc except the lower level regulated runs.
I must admit seeing it like this makes me start leaning towards regulated drivers more as opposed to just FET driven.
Different cell but here's the FW3A started on Max for comparison too.

Took me a while to realize they were output readings… :smiley: actually I prefer these over discharge rigs graphs if I were to compare 2 cells directly.

I’ll put bigger labels on for you next time :smiley:

Well, not really. I've conducted a practical DIY test to prove that. I once set a small test led attached direct drive to a couple old li-ion cells which, after a little bit more than a couple days of discharge (I could still see the die lit), I put my finger on the stuff and connected one of the cells which somehow wasn't making contact and wooosh! The led got again a lot brighter (and my eyes :-D were hurting). Since I was using flimsy wire and the cells were going to be recycled anyway I didn't cared if one cell was going to recharge the other and etc, they were initially at less than ≈40% anyway. So I decided to wait again, and after ≈3 additional days, with the led emitter very dimly lit, I disconnected the stuff. I could have let it go even lower if you will, but I think there is no point. This simulates a slightly below 2.5V discharge at ultra low discharge rate.

Wanna know the result? After some resting time (2 or 3 hours maybe, can't recall for sure right now) one of the cells measured 2.59V in my multimeter and the other scored just a tiny bit below 3V. As you may guess the 2.59V unit was the one which was discharged first.

:-)

Fri, 05/24/2019 - 22:52

dont batteries have a cut off around 2.5V anyways that’s supposed to kick in as a last resort?

No, unless they are protected.
And protection circuits are not bulletproof either, f.e. they can fail to notice very low current.

A bit off topic question. May someone help me identifying the OEM of this cell:

I got a very good deal of Lii-100 charger plus button top cell. Since I knew no way it was an NCR18650B I decided to remove the button top, and that is what I got after a nice while of play with my rotary tool.

The cell scored 3256.5mAh in my Lii-500's less optimistic channel which, according to my reference data, is equivalent to a ≈3336.5mAh Henrik score. More or less, of course. Which means that cell may be some “34” model of an unknown (to me) manufacturer. May someone shed some light on this?

Thanks. :-)

Cheers

Thanks very much for your test, but i can not open the link,
could you help me?Thanks

I know this battery factory made in china

Thanks CRX for the very useful comparison graphs. These new Vapcells are a game changer for 16340 and 14500 lithium ion flashlights. Now I am more interested in these small flashlights with the more usable capacities offered by these new Vapcell cells.

Thanks you very much, :slight_smile: