Review request for HKJ [Rechargeable Batteries]

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 :-)

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.

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.

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.

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

Hello! :-))

How are your battery queues doing, Henrik? Is there place for some 2800mAh max cell?

Lanzhd 18650 Store has some sort of rewrapped power cell in purple wrap, likely manufactured by BAK Power. Also, a realistically rated USB micro-B rechargeable 650mAh 16340 li-ion cell.

There's a small AliExpress sale in a few hours. I am not particularly interested in the 16340, but others may. In the meantime I may look for some co-funding for the other cell (because ;-) I'm rich). Anyone here?

It is winding down, lately I have published fewer battery reviews due to that.

?

To send you some of my previously mentioned cells, that is. Just looking for some shared interest.

I am interested in that.