Latest release Vapcell 21700 5600mah 12.5A battery

I received my Vapcell 16340’s today. I ran a 3 amp discharge test on the icharger from fully charged. I got 638mah at 12 min and 45 secs down to 3v.
Down to 2.75v, I got 726mah at 15 min and 25 secs. This test was done at a constant discharge of 3 amps and there’s no doubt this cell will make 800mah or more at a 1 amp or less discharge.
When I started the test the voltage stayed decently high. It started at 3.7v under the load and fell rapidly to 3.6v where it slowly crept down to 3.5v after about 3 mins. The cell done very well holding around 3.5v for awhile.
We have a new 16340 King, less sag and more capacity :person_with_crown: .
Thanks Vapcell for improving on these smaller size cells. Great Job :+1: .

Thanks you very much,moderator007

Thank you very much for your feedback.

At present, spot welding machine has been upgraded and welding quality has been improved.

Analyzing chargers usually are rather bad at measuring battery internal resistance. Contact resistance is easily burdened by oxidation or debris. I also guess you meant to say mΩ instead of Ω, don't you? ;-)

XTAR Dragon VP4 plus uses probes to measure resistance and they are accurate when comparing to my fluke. I’m assuming I got old stock before they upgraded their button top welding process.

If that is so I would remove the button top, carefully precision sand down any welding bulges and then rewrap those cells FaintReality.

Old version spot welding process, button top 14500 1000 mah, AC impedance less than 60 milliohms

the 14500 button top is very small , no good contacts, and the AC internal resistance meter is very slow to check, so there is no full inspection.

DC internal resistance measurement is inaccurate and vulnerable to contact internal resistance

But they’re basically oks.

There may be very few weld defects.

We can only improve the welding process, deeper breakdown and less oxidation as far as possible.

If it is a capacity battery, such as 1A current output, the button top internal resistance has little effect.

battery with pcb will add more AC IR,

If it is a high-power battery, it will have a greater impact.

For example, if the AC impedance of samsung 30T, 7mOhm is changed into 10mOhm by adding a button top, then the continuous discharge is only about 30A.

I understand vapcell Dennis, but FaintReality reports twice the internal resistance of an EBL 14500 for his Vapcell 14500. I know his figures are far from real DC resistance values but to me that means his Vapcell 14500 is likely well above 200mΩ of internal resistance. So pretty bad. Being so removing the button top and using a rotary tool with a grinding bit to gently fix the welding remnants is a wise choice.

Using the Xtar Dragon VP4 plus, I got the following results from my current 14500 button tops:

EBL #1 - 54 mohm
EBL #2 - 49 mohm
EBL #3 - 49 mohm
EBL #4 - 54 mohm

Vapcell (gold) - 103 mohm

Efest (2018 purple) - 29 mohm

So although the Xtar may not be 100% accurate, it is more than sufficient to use for comparison sake, which raised a red flag when comparing the Vapcell to the Efest and the cheap eBay EBL batteries.

I would remove button top and re-wrap, but these batteries are for a Sofirn SF14 V2.0 which requires button tops. I may just do it out of curiosity sake…

Sincerely apologize, please let me know your order number, I will call Ail Express customer service to contact you, compensation to you.

DC IR during 3.5A discharge:

Flat top 14500:

Button Top 14500:

I just got the 4 wire cell holder today. Still not entirely sure how relevant or useful this information is.

Vapcell fellows please correct the thread's title. “Ture rating for you on flashlight batteries,Buy the battery now to send free zipper case” is wrong for many reasons. I understand the culprit here is a language barrier, so let me help you. “Ture” is a misspelling; “batteries” are just batteries, no need to specify “for flashlights”, “for vaping mods” nor ;-) “for anal hair clippers”; the last part is the worst one, I guess what you want to mean is you send a free zipper case with each pair, don't you? Since you seem to sell your batteries in pairs this is what I would write in the title instead:

Vapcell, true rating for you on batteries. Buy now and get a free zipper case!

Cheers

Well…

After nearly a month of exciting anticipation waiting on the new Vapcell 16340 cells to be delivered the package finally arrived.

Just the package.

An empty box.

Oh, except for some packing material to keep the air inside from being damaged.

Very thoughtful :+1:

:person_facepalming:

I need a little help here I think.

:-D

Mine 16340 were missing from the package too. Vapcell offered to resend them.

Dear Barkuti
Thank you very much for your advice. We will improve ourselves.
Have a nice weekend

Interesting. What country? This is more than coincidence now.
What say ye Vapcell?
Vapcell has apparently sent me replacements too so we will see what happens but if I don’t get them soon then yeah…

:smiley:

Here is another test of the Vapcell 14500 with a 8x7135 driver in the meantime:

:person_facepalming:

I hope you will receive it as soon as possible.

Do you know how to delete previous posts on the forum?Thanks

There is a delete button on each of your posts but not for threads.
You need to ask Admin to delete threads.