I purchased and tested a gold 14500 button top this evening. The discharge capacity was 966 mAh, with a charge capacity of 970 mAh’s at 4.18 volts.
The resistance was 103 ohms. Seems a bit high, especially in comparison to my Efest 14500 (29 ohms) and my EBL 14500’s (all four are 49-54 ohms). Thoughts?
This battery is the flat top of the original version, and the product consistency is very good.
Some customers need a button top, which requires spot welding machine welding
Sometimes there will be oxidation problems, which will lead to the increase of internal resistance of batteries.
We are also improving welding technology.
Thank you very much for your feedback.
The other batteries you’re talking about are the original version, button top, not welded.
Can you accept flat top? You can use tools to remove the button top. Then the battery is flat head.
Internal resistance less than 60 mOH
Thank you
Your charger is not reading IR of button tops accurately. Your other thread explains it
I got the Xtra Dragon VP4 plus which uses probes to measure both voltage and resistance. All my other battery testing looks good, even a few button tops I have.
Prior I was using the Miniboxer C4-12 which is not accurate like mentioned.
Last time, when I ordered button top Vapcell batteries from the Vapcell AliExpress store, I got button top batteries with significantly increased internal resistance compared to the flat top ones of the same type. Can you confirm, that Vapcell have revised the method of applying button tops, or it is still not recommended to get button top battery if I would expect the same (or nearly the same) current specification for the selected battery?
And this is not a charger related problem, as I have reliable Samsung INR18650-30Q button top batteries, which has nearly same internal resistance reading in my chargers, as the flat top ones.
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 
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Thanks Vapcell for improving on these smaller size cells. Great Job 
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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
I need a little help here I think.
:-D