Latest release Vapcell 21700 5600mah 12.5A battery

Commercial Sellers' Spot
519

I fear an internal short while charging them up. I just found this on Battery University:

„Li-ion self-discharges about 5 percent in the first 24 hours and then loses 1–2 percent per month; the protection circuit adds another 3 percent per month. A faulty separator can lead to elevated self-discharge that could develop into a current path, generating heat and, in an extreme case, initiate a thermal breakdown.“

Source: https://batteryuniversity.com/learn/article/elevating_self_discharge

Thanks. I guess it’s best to first separate cells with deep discharge state (< 2.5V) from those that still show a reasonable voltage (> 2.5V and < 4.2V). I would say the deep discharged ones should better be disposed right away without any attempts of charging.

520

Maybe I am interpreting that statement incorrectly, but 5% of 4.20 volts is 0.21 volts and I would be concerned if any of my Li-ion batteries self-discharged to 3.99 volts within 24 hours after being fully charged to 4.20 volts.

521

Your statement is not accurate. You cant just do 4.2*.05 for charge percent. See our very own HKJ’s write up

In any case settling down 5% from 4.2 for a large battery like this would still be around 4.1x

522

Thanks for the correction, what I forgot to take into account is realizing that the discharged voltage of Li-ion is ~2.80 volts, therefor:


4.20 volts - 2.80 volts = 1.40 volts
5% of 1.40 volt = 0.07 volts
4.20 volts - 0.07 volts = 4.13 volts


This self-discharge voltage within 24 hours, seems more reasonable.

523

This goes to show that you shouldn’t rush QC, because QC always takes longer than the rest of the company wants, as they see it as “preventing them from making money”, when its more like “assuring they can make money” off of the product.

524

Also not right since that implies that at 3V there is still 15% battery left. 2.8+0.07*3 = 3.01V

Most of the capacity comes from the higher voltages and not much left when the battery is low voltage. Either way, it would be nice if some data sheet spec exists per battery to say “expect is to maintain >= this voltage after 1 month, 6 months, 12 months” or similar.

525

Thanks "contactcr" for increasing my understanding.

I am an older person who worries too much to sleep well at night. Flashlights have given me something to do at night and the little pleasures from collecting and comparing many varieties of these "budget light treasures" keep my mind from dwelling on the larger problems of life.

Researching and learning this technology which is new to me (and having to remember the different user interfaces of each light) also helps keep my mind sharp. I do not post much and wish I had more to contribute, but I do read almost all of the BLF posts daily.

Thanks again to all on this forum.

526

Also resting voltage is waay different than load voltage.
If a cell has a resting voltage of 3.0v it is 99% dead, as when you apply a load to it, it quickly drops towards 2.5v.
Whereas if you run a constant 1 amp discharge till it hits 3.0v, it may “bounce” back up to 3.3v or higher.
And yes I pulled these numbers out of my butt, but the point still stands.

527

Yes, and I want it back :expressionless:

Are you listening, Dennis?

528

Hello, this white 16340 has been out of production for a long time

At present, vapcell 16340 650mah 6A T6 battery has just been launched, which is also white

If there is a demand, you can consider purchasing

529

Will do, but can’t find it in your AE shop.

530

Any reason for that, Dennis? The other cell had higher capacity and current! Was there any suply issue or security?

531

These are poor capacity and dischcharge current so i wouldn’t call them upgrade.

Why going south when old white was the king?

532

The old version of white battery was customized and researched by vapcell alone in cooperation with the battery factory, but the sales volume was too small for the battery factory to bear, and the factory had to rely on large sales volume to make money

So it has stopped production

The flashlight Market is too small, and the sales of high power batteries are not optimistic

Vapcell 14500 1000mah 10A also encountered such a low sales situation
Hope the future will be better

Vapcell T8 and T6 can meet the needs of high capacity and high power flashlight users

Welcome to purchase :slight_smile:

533

Yep, we have to rely on other markets to keep these batteries alive.
Years ago, it was laptop batteries that brought 18650s (low drain) and power tool batteries (high drain). Then Tesla with their massive orders of 18650s from Panasonic (later to be 2170s), and then Vaping with more of the high drain variety of 18650s.
Nowadays we’re basically relying on Tesla, Vaping, and Power tools to get the batteries that we want, so we have to work around that. I’m honestly surprised that we got 26650s.

534

It looks like the T6 16340 compares quite admirably to the old 800mah white version. The voltage curve is more square, and the capacity difference is mostly made up at low voltages (<3.3V). 6amp curve looks great and is really all that’s needed from this size cell. Hope to see HKJ add it to his comparison tool, but it seems like it might be the best option available. If Illumn gets these I’ll buy a pair before they disappear too.

535

That’s sad to hear.

So that means we’re not going to see the Vapcell 800mAh 16340 7A (white) anymore in the future.
HKJ reviewed it here:

And the same will be true for the Vapcell H10 1000mAh 14500 battery - we may soon not see it anymore?
HKJ reviewed it here:

Are there other (special formulated) Vapcell batteries that will not be produced anymore in the near future?
Eg. is Vapcell T50 still going to be produced? How about the rewrapped Sony VTC5D (Vapcell 2800mAh black) or the Sony VTC6A 18650?

536

very interested.

537

Refund granted on the two K64's. It went through the process quick, but required submitting a pic so I just took a pic of the cells with my notes.

538

Wait, that wasn’t the 16340/850mAH, was it?

Ancient history by now, but I won one (two?) of the 850s back last July in a giveaway‡ but never got ’em.

I still got a bevy of 16340 lights I wanted to load up with decent cells, but never got anywhere with that.

Especially my i332s that could benefit from decent 16340s, ’though the come-with Wuben cells seem pretty good.

So what’s the consensus on decent 16340s… at least those that can be gotten relatively easily?

—

‡ Had to goggle it, Giveaway!！vapcell battery The event is over，The winners have been announced . No pix, model numbers, etc., for the 850s in question. So I take it those aren’t the white 800s, right?