Latest release Vapcell 21700 5600mah 12.5A battery

Wow the K64 is incredible! Thanks for sharing!

Yes they’re Green, F14 is right.

Any idea where they were purchased?

If I am not mistaken they were bought from Vapcell‘s AliExpress store.

K64 sucks… After ~two weeks of non-use have 2.04V and 0.20V!!! :person_facepalming:

Sitting inside or outside a device?

Too bad. I had high hopes for this cell.

It certainly sounded decent, but unstable voltage isn’t good. First on my K30’s and now hearing this, their QC sounds like a real issue at the moment

Outside

Are you able to get a refund?

I hope so, but I just opened a dispute :smiley:

Oh boy, might have missed this since I've not been keeping track of usage and level. I'll check mine same way, assuming your non-use means you had them sitting loose, not in a flashlight or charger.

I used mine in testing, not sure when, at least couple days ago. They read 3.92V and 4.18V now, and probably not re-charged after use. Recorded the values and time now - will see how they do over the next week on the shelf.

So far after 54 hours, 1 cell no change at 4.18V, the other dropped from 3.92V to 3.71V. Not sure how much usage each got though - wasn't keeping track, but neither got much usage except for high current drain in tests. I'll continue to monitor these 2.

Seems like I may have the same problem maba has above, but for me in just one cell for now.

This is bad news, can't trust these K64's . They disappear from the Ali store, and Dennis doesn't respond here or post what's going on at least.

This is beyond pathetic. I see Dennis has been online several times recently to read and ignore our comments about all the failed cells. So sad that he decided to tuck his tail between his legs and ignore the problem. This has happened at least a few other times with Vapecell, which is why I dont own any of their cells and likely never will.

Don’t forget to file your AliExpress disputes to get your money refunded. If that fails, file a charge-back through your credit card company. Also please leave appropriate negative feedback to warn others. For those who visit similar forums, spread the word so others can avoid this vendor and their disappointing non-existent customer service.

Its alright Dennis… I just did my part on your behalf to allow you to save face and continue hiding your shrunken head in the sand. Maybe you’ll be reincarcerated as a ostrich some day soon, so you can continue doing what comes naturally!

That doesn’t sound good.

I ordered a few pieces of K64 last April 3. Vapcell/AliExpress gave me a tracking number on April 8. But that tracking number doesn’t give any update at all using multiple tracking sites (17track, postal.ninja, track24, etc. sites) It’s been over 1 month since those K64 have been shipped out, so if they’ll discharge to low voltage, in case I receive the package, then several of them may have self-discharged to low voltages…

Unless you have the ability to test your batteries, I would only buy from a trusted retailer/supplier for now. There’s only 1 US retailer I would buy Vapcells from because they perform their own QC and their QC is at a higher standard than Vapcells. I bought the F14 from them. I don’t have a need for the K64 unless I buy another flashlight and I don’t really want to.

Sad state of affairs.

So obviously this sounds like a more extreme case of self discharge but what is an acceptable level of discharge anyways? I suspect re-wrappers don’t promise anything but do OEM’s even publish a spec? You see it in NiMH for instance X% battery life after 6 months in storage. Higher drain batteries tending to have shorter storage life for that chemistry anyways.

Why do people buy re-wrapped cells not knowing what cell is underneath?

The only good 26650 cells i’ve heard of are all based on the PLB55A cells.
I haven’t heard of a cell from PLB greater than 5500mah, and they are like the ONLY manufacturer of 26650s.
There’s no way Vapcell has a “new” cell that gets 6400mah….UNLESS they are “binning” the batteries that test that high, which doesn’t sound like that’s the case.
Also, no response from Vapcell, not a good look for Vapcell….
But hey, they pulled ALL the K64 listings form Aliexpress to prevent people from buying them while they re-evaluate their QC.

Their gold 5300mah G53 26650s I’m pretty sure are based on the PLB55-A, so buy those if you want a pretty looking 26650…

26650s are getting obsolete with very high quality 21700s on the market from Samsung, LG, Sony, Molicel, Panasonic (Tesla), so maybe its time to move on?

Did you try to ask Vapcell's customer service what freight carrier they were using? Mine are being shipped by Meest Group, probably via ship from Shenzhen, CN via Rotterdam, NL and then further to Germany. I ordered my six K64 batteries on March 27, 2021, i.e. 45 days ago. According to tracking (which also did not work for several weeks) my order it is still being processed in Guangzhou, CN. I do not expect it to arrive within another 45 days. :-D So, for lithium-ion batteries it seems to have become really painful handling logistics on a reasonable price level.

Try to look at it from a positive side: If those cells you ordered arrive with ultra-low voltages, you will know immediately these are defective. Otherwise it probably takes to pay some more attention (measure resistance/impedance, charge to a set level and observe voltage sag, etc.).

These are intruiging questions that I would also like to see answered. So far, except for one Lishen LR2170SA and one Sofirn DLG 18650 battery (probably just bad luck?) none of my batteries, regardless if these were cheap Dolidadas or high priced Samsungs, have indicated any significant voltage sagging over the course of 3 years. I mean, I charge them to let's say 4.16V. Some days later they settle at let's say 4.12V and that's it. 6 months or 12 months later - still 4.12V.

Probably working with a factory to produce these K64 solely for them which is where the QC issue might come from.

Here’s hoping Hank redesigns the D4sV2 for a 21700 battery.