Review request for HKJ [Rechargeable Batteries]

It’s back in stock. :slight_smile:

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. :-)

Cheers

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 O:) believe.

Cheers ^:)

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

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

Cheers

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.

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.

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

You can find it for LiIon here: List of tested batteries

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.

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

Thanks for your help, tests and site!

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 ;-) 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 :-)

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.

:-)

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

Here are a few inexpensive sales for them:

Thanks in any case.

Mmm, looks like the SX1308/MT3608 will have to wait. :???:

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.

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.

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/

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

Cheers :-)