Review request for HKJ [Rechargeable Batteries]

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vapcell Dennis
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Barkuti wrote:

Generally speaking the price of these newer cells leaves me  far from being thrilled. The newer 16340 800mAh and Vapcell’s 18350 “1100” (cough!) are the worst offenders, particularly the 18350 which can be bought from a well known alternative source at a shockingly Wink better price. Please lower your jacked up 18350 prices Vapcell, please.


I do not like button tops. I do not like disguising cell practices.


 


Cheers Party 

Thank you very much for your suggestion.

Our main mode of sales is wholesale. There are distributors in many countries and regions.

Some distributors complain that our retail sales are too cheap to affect their prices.

The main purpose of our retail sales is that some countries do not have vapcell batteries to buy here.

If there is a local vapcell distributor, it is recommended to purchase from the local distributor.

Sometimes we also have promotional activities, with big discounts.

please keep an eye, thanks.

16340 batteries. It took a lot of time to develop them.

And large MOQ

We’re under a lot of pressure, too.

We listen to the suggestions of forum users, develop better 16340 batteries in the market, and serve users.

That’s our value, looking for the best batteries

If you think it’s a simple job, you can call these big companies efest, awt, nitecore and so on to make the latest version of 16340 batteries for you.

If any of you need 16340 batteries in large quantities, we will give you a preferential unit price.

Batteries are not only unit price, but also service, certification, insurance and after-sales service.

Our small package costs more, about $6. Arriving in Europe and the United States in about two weeks, we also have Commission on the express platform. Lithium batteries are sensitive goods, and there are many lost parts. We need full compensation.

I hope you understand us.

Have a nice weekend Smile

Agro
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Would be cool to see a review of this Acebeam 21750 cell-powerbank:
https://eu.nkon.nl/rechargeable/21700-20700-size/acebeam-21700-5100mah-2...

Satan@103TFS
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HKJ …I just found that LiitoKala now have new 21700 battery 5000 mAh https://www.aliexpress.com/item/2019-LiitoKala-Lii-50E-21700-5000-mAh-Li...
since AE may be one of a few choice for non US could you please test this one?

HKJ
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Agro wrote:
Would be cool to see a review of this Acebeam 21750 cell-powerbank: https://eu.nkon.nl/rechargeable/21700-20700-size/acebeam-21700-5100mah-2...

It is out of stock.

Satan@103TFS wrote:
HKJ …I just found that LiitoKala now have new 21700 battery 5000 mAh https://www.aliexpress.com/item/2019-LiitoKala-Lii-50E-21700-5000-mAh-Li... since AE may be one of a few choice for non US could you please test this one?

My queue for batteries above 2800mAh is 3 to 4 months, I do not really want to order other high capacity batteries at the current time.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Agro
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HKJ wrote:
Agro wrote:
Would be cool to see a review of this Acebeam 21750 cell-powerbank: https://eu.nkon.nl/rechargeable/21700-20700-size/acebeam-21700-5100mah-2...

It is out of stock.


It’s back in stock. Smile
Barkuti
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The following is a copy/paste of a question I posted here.

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. Smile

 

Cheers 

Innocent

Barkuti
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Hello!

Just a brief remark. Long ago Mooch noticed Vapcell's 18350 1100mAh suffered a cell change. It may be worth a retest of it so we can check what its current actual level of capacity, energy, discharge and power delivery ratios are.

Pretty sure Vapcell should be willing to cooperate in shedding light on this. I Innocent believe.

 

Cheers Party 

Innocent

mrheosuper
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https://www.yoycart.com/Product/573475203018/

i have just received this cell( not from this seller), so far so good, the capacity is in range 3400-3500, and the IR( measured with 4 wires probe) is <23mOhm

i think you should check it, maybe the best high capacity 18650 right now

ps: there are a lot “interesting” cells in China, if only you can buy from there

there is a 3100mah cell and 35mOhm IR that cost lest than $2, and the NCR18650BG i got is only $2

Forgot my pen

Barkuti
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I'm here just to ask, was the Battery capacity/DC Power Detector tested?

 

Cheers 

Innocent

HKJ
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Barkuti wrote:

I’m here just to ask, was the Battery capacity/DC Power Detector tested?

Not yet, it is in the inbox.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Barkuti
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HKJ wrote:
Barkuti wrote:

I'm here just to ask, was the Battery capacity/DC Power Detector tested?

Not yet, it is in the inbox.

Borrowed a couple pictures from the item's user reviews:

 

 

Wow! Big arse device. Around 4½ × 25/16 inches or 11.4 × 5.9 cm. Hope the E-meter application works fine.

 

Innocent

Barkuti
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mrheosuper wrote:
https://www.yoycart.com/Product/573475203018/

i have just received this cell( not from this seller), so far so good, the capacity is in range 3400-3500, and the IR( measured with 4 wires probe) is <23mOhm

Mmm, gross selling price there leaves room for improvement imho. Shipping charges stink a bit high.

23mΩ internal resistance? I guess that is an AC 1KHz IR figure, if it is DC IR the cell is definitively high discharge.

Would you mind sharing where did you bought them? Thanks.

 

Innocent

ZoomieFan
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No idea where to post website requests.
Some really great improvements on your website lately. Saves me a lot of time!

Request: Tested mAh at xA

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

HKJ
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ZoomieFan wrote:
Request: Tested mAh at xA

You can find it for LiIon here: https://lygte-info.dk/info/batteryIndex.html

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

ZoomieFan
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That’s where I looked.

So I overlook it somehow, or I didn’t explain it clearly…

When I hoover my mouse pointer over the link on the left a window pops up with measured values.
That’s great because that’s what I’m looking for.
My request is that those measured values are also in the table so I can sort on them.

You see, I fully trust your tests. Yesterday I was searching for 14500’s that have a max drain of at least 2A.
So I want to sort mAh at 3A, and then I buy the cell with the highest mAh.
That way I just have to click a few times instead of checking all cells one by one.

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

HKJ
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ZoomieFan wrote:
That’s where I looked.

So I overlook it somehow, or I didn’t explain it clearly…

When I hoover my mouse pointer over the link on the left a window pops up with measured values.
That’s great because that’s what I’m looking for.
My request is that those measured values are also in the table so I can sort on them.

You see, I fully trust your tests. Yesterday I was searching for 14500’s that have a max drain of at least 2A.
So I want to sort mAh at 3A, and then I buy the cell with the highest mAh.
That way I just have to click a few times instead of checking all cells one by one.

3A is in the table and you can click on the header to sort it.
You can also select different discharge voltage above the table, it is best to only check one voltage at a time.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

ZoomieFan
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Aaaaarrrrrgh, somehow I managed to misunderstand something so extremely simple….
This is exactly what I want!

Thanks for your help, tests and site!

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

Barkuti
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I'm here for a small review proposal or suggestion, DIY stuff gizmo. It is not a battery, but I think this thread is the closest related thing to (maybe some other generic or DIY review request thread could be nice).

From a few sellers' list:

It is an inexpensive “TC4056A” li-ion charging board with attached adjustable output boost converter. There is no protection circuitry for the battery but they're Wink easy to find.

The board uses a schottky diode at the output (SS36, by the way), this means it could be possible to set it in parallel with others (but needs very tight output voltage adjustment).

For easy DIY li-ion powering electronics stuff.

 

Cheers Smile 

Innocent

HKJ
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Barkuti wrote:
There is no protection circuitry for the battery

This nearly makes it useless for LiIon batteries or you have to add an external protection board.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Barkuti
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HKJ wrote:

This nearly makes it useless for LiIon batteries or you have to add an external protection board.

That was maybe a hasty comment. The onboard output circutry is a boost engine, this means at some point it'll stop working due to too low battery voltage.

Found a clearer picture here, "B6288y" boost chip markings. Looks to be an SX1308 or MT3608.

I'd add a standalone BMS, though.

 

Smile 

Innocent

Barkuti
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Innocent

Barkuti
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Mmm, looks like the SX1308/MT3608 will have to wait. Question

A fellow from the far east who sometimes posts in this forum suggested me the above fake NCR18650B I spoke about is a BAK 18650-34T, with performance probably on par with NCR18650GA. This was sometime ago, but definitively I do not seem to find a way to obtain 18650-34T cells with their OEM wrap directly for sale in AliExpress:

 

 

I have a couple sales in my wishlist for what looks to be these cells, with what looks to be a pentagon top clearly distinguishable under small soldering tabs or cables. They are disguised as “green berets”, though.

Any interest in this?

Thanks.

 

Innocent

mrheosuper
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Barkuti wrote:

mrheosuper wrote:
https://www.yoycart.com/Product/573475203018/

i have just received this cell( not from this seller), so far so good, the capacity is in range 3400-3500, and the IR( measured with 4 wires probe) is <23mOhm


Mmm, gross selling price there leaves room for improvement imho. Shipping charges stink a bit high.


23mΩ internal resistance? I guess that is an AC 1KHz IR figure, if it is DC IR the cell is definitively high discharge.


Would you mind sharing where did you bought them? Thanks.


 



yeah, it’s 1khz sine IR measurement, i measured the VTC5A with that meter, i got 9.8mOhm i bought those from 1688.com ( wholesale website from China) so i guess it’s quite hard for HKJ to purchase these cells from there.

Forgot my pen

Barkuti
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Barkuti wrote:

The SX1308/MT3608 are popular and widespread boost modules. Would you mind giving them a shot, Henrik?

I could buy a pack of modules and send it to your address, Henrik. If you don't mind, that is.

I found some SX1308/MT3608 related information very recently: https://www.instructables.com/community/Why-is-my-step-up-converter-not-boosting-voltage/

y8492b in the linked instructables page wrote:
The problem with most of the MT3608 and SX1308 modules is not the device, but the same flaw in the circuit design. If you look at the datasheet for these, which actually the same, you will find that the absolute maximum voltage allowed on the FB pin (feedback) is 6v.

Unfortunately, this can be easily exceeded because of the simple use of a 10k pot in the resistor divider from VOut to the FB pin. In operation FB is expected to be about 0.6V, but as the 10K pot can be reduced to zero, it can put VOut on the FB pin.

As the pot is turned (usually anticlockwise) the voltage on FB will increase, until it exceeds 0.6 volt and the device turns off. At that point the module will simply pass through the voltage from VIn to VOut via the inductor and diode.

Which means when the pot is connecting FB to VOut and VIn exceeds 6v plus a diode drop, the device will be destroyed.

Other than modifying the circuit, the best approach is to always turn the pot fully clockwise (most designs), then apply voltages and very slowly start turning anticlockwise for the required output.

So these small boards feature a design slip-up. Good to know.

 

Cheers Smile 

Innocent

HKJ
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Barkuti wrote:

I could buy a pack of modules and send it to your address, Henrik. If you don’t mind, that is.

That would be fine, but it may take some time for me before I publish the review.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:

That would be fine, but it may take some time for me before I publish the review.

PM me the address then (a valid AliExpress' address), so I can submit it to the AliExpress seller I chose to buy from. This is the way I can afford it to be. Thanks.

Innocent

Barkuti
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Question geared for Henrik or any other knowledgeable lads.

Concerning the aforementioned 300V/100A Battery capacity/DC Power Detector back then here: the device requires some sort of test load but, what sort of load?

I see metal shell case power resistors for sale in many places. Looks like the sort of thing but, how does the above and similar meters use them? Do they switch the load with variable PWM duty cycle to keep a constant current or a constant power? 

Trying to determine what resistor values would cover a few low voltage li-ion tests.

Innocent

Barkuti
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Just remembered the cells the Kreosan Ukrainian guys played with in this thread's video: Testing 18650 Safety - Russian Style

I believe their OEM is Heter, meant for the electric vehicle market. I wonder if there's room for a review of them, they're technically a mid-power sub-2800mAh cell (EAIEP 2pcs “26F” sale link).

Thanks.

Innocent

HKJ
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Barkuti wrote:
I see metal shell case power resistors for sale in many places. Looks like the sort of thing but, how does the above and similar meters use them? Do they switch the load with variable PWM duty cycle to keep a constant current or a constant power? 

The meter only measures, it do not do any PWM or other regulation.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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