Review request for HKJ [Rechargeable Batteries]

779 posts / 0 new
Last post
HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark
Barkuti wrote:

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

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

Barkuti wrote:
In the meantime I may look for some co-funding for the other cell (because Wink

?

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

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

HKJ wrote:

?

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

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark
Barkuti wrote:

HKJ wrote:

?

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

I am interested in that.

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

HKSJOSHUA_
HKSJOSHUA_'s picture
Offline
Last seen: 1 week 2 days ago
Joined: 06/28/2019 - 01:25
Posts: 118
Location: OKC

Anyone know who makes the manker 2600mah flat top battery? I know its just a rewrap but just curious as they retail for 18 dollars

Appreciate all the little things in life!

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

Hello!

Quick question aimed at Henrik, did you receive the VariCore 32700 LiFePO4 6500mAh (Gray) cells from AliExpress' store #1874160 (https://entemple.aliexpress.com/store/1874160)?

Oh! Wellp, nevermind really. Found this Shop2097037 with slightly better pricing, interesting cells and cell packs.

They're selling this weird LiitoKala branded li-ion 7200mAh Question 26800 cells with tabs, guess that is some electric vehicle market product (5C discharge rating). And I must also say, without a doubt, that 7200mAh in a 26800 is high energy density, beating PLB 5500mAh at least on paper.

Henrink, did you ever tested some electronic load like the following? (guess the answer is not yet)

 

https://www.aliexpress.com/item/32725711985.html

 

Had a different, more display fancy electronic load in my wishlist but people were reporting failure to disconnect load after voltage cut-off in it. This one has good reports, guess I would only need a battery holder to complement with it. 

 

 

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

Found a cheaper sale for the 26800s in small quantities, without tabs and less overrated; just in case Henrik would want to test such weird cells: https://www.aliexpress.com/item/4000218361115.html

 

 

Does anyone knows what OEM could be manufacturing such spring rolls? 

Sun, 10/20/2019 - 08:49; Sun, 10/20/2019 - 09:13

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark
Barkuti wrote:

Hello!


Quick question aimed at Henrik, did you receive the VariCore 32700 LiFePO4 6500mAh (Gray) cells from AliExpress’ store #1874160 (https://entemple.aliexpress.com/store/1874160)?

I got and tested the Varicore batteries some time ago.

Barkuti wrote:

Henrink, did you ever tested some electronic load like the following? (guess the answer is not yet)

I started on in once, but it died on me. The problem is when they use a single mosfet transistor, standard mosfets are not good at analog regulation and cannot handle anything like the rated power when doing that.

Barkuti wrote:

Found a cheaper sale for the 26800s in small quantities, without tabs and less overrated; just in case Henrik would want to test such weird cells: https://www.aliexpress.com/item/4000218361115.html

That cell is a problem, it will not fit in my battery holders, 70mm long is about maximum I can test.

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

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

HKJ wrote:

Barkuti wrote:

Henrink, did you ever tested some electronic load like the following? (guess the answer is not yet)

I started on in once, but it died on me. The problem is when they use a single mosfet transistor, standard mosfets are not good at analog regulation and cannot handle anything like the rated power when doing that.

I guess it died once you tested it at some power level within theoretical specifications, do you remember how much was that?

HKJ wrote:

Barkuti wrote:

Found a cheaper sale for the 26800s in small quantities, without tabs and less overrated; just in case Henrik would want to test such weird cells: https://www.aliexpress.com/item/4000218361115.html

That cell is a problem, it will not fit in my battery holders, 70mm long is about maximum I can test.

 

Found a review of it: Queen Battery QB26800 6800mAh 20A - the big guy! @ Thunderheart Reviews

 

 

Nice battery holder, doesn't it? Big Smile 

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark
Barkuti wrote:

I guess it died once you tested it at some power level within theoretical specifications, do you remember how much was that?

It was close to maximum rated power.

Barkuti wrote:

Nice battery holder, doesn’t it? Big Smile 

It is similar to the ones I used before.

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

Th558
Th558's picture
Offline
Last seen: 4 hours 54 min ago
Joined: 01/30/2016 - 16:19
Posts: 930
Location: United Kingdom

I bought some aaa batteries from ebay. The picture showed contour batteries. I think this is a good company which closed down or something…when they arrived they were Digimax. I discharged then charged them at 200mA in an Accupower IQ328 and two of them kept fluctuating between 1.41v and 1.42v. I ended up stopping the charge after 5 and a half hours! I know the current should be at least 0.3C but I wasn’t expecting this from brand new batteries. I always select the lowest current for new cells and when condition cells.

4 AAA batteries

Hobbyfotograaf
Offline
Last seen: 12 hours 30 min ago
Joined: 02/11/2011 - 16:25
Posts: 377
Location: Belgium

Today i tested the “7000mAh” LiFePo4 cells after they are used for more than 10 months in the solar powered light. https://nl.aliexpress.com/item/32878468860.html?spm=a2g0z.10010108.10000...
According to the HTRC B6V6 balance charger the discharge capacity of the 2S battery pack is still 6459mAh (about the same as in the first test, almost one year ago).

The balance board does not balance the cells, but that is no problem because charging and balancing the battery pack after taking it off the wall took only 4 minutes and 2 seconds
(The cells were charged and balanced before capacity test.)
If there would have been a large difference between the two cells, the charge/balancing time would have taken much longer than 4 minutes.

These cells are much better than the Original lead-acid battery that became useless after about one year.
A new 6V/4A lead acid battery is also more expensive than these cells + the protection board.
The LiFePo4 cells are still like new, it looks like they will last many years in that solar powered light.

I like the tests of new cells, but i am also interested in re-tests after they have been used in “real life conditions”.
I know it is very difficult to do that, but in this case i will continue testing these cells once a year

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

Hobbyfotograaf wrote:

The balance board does not balance the cells, but that is no problem because charging and balancing the battery pack after taking it off the wall took only 4 minutes and 2 seconds
(The cells were charged and balanced before capacity test.)
If there would have been a large difference between the two cells, the charge/balancing time would have taken much longer than 4 minutes.

In my experience balance boards are designed to start resistor draining the cells at some overvoltage (overcharge) point. This, in my opinion, is a simple but effectively useless approach as overvoltage hastens cell damage (you want your cells to live long, not to die soon).

To keep cells in balance manually I would install voltmeters and pushbutton enabled bleeding resistors at each battery stage.

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

baustelle
Offline
Last seen: 7 months 4 weeks ago
Joined: 01/16/2018 - 18:48
Posts: 30

Hello HKJ,

 

Have you planned to test the upgraded version of the formerly reviewed Kentli or the AAA version?

https://www.aliexpress.com/item/32798542354.html

https://www.aliexpress.com/item/32798806801.html

HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark
baustelle wrote:

Hello HKJ,


 


Have you planned to test the upgraded version of the formerly reviewed Kentli or the AAA version?


https://www.aliexpress.com/item/32798542354.html


https://www.aliexpress.com/item/32798806801.html

Not really, but now you asked I decided to order them.

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

nuemtol
Offline
Last seen: 3 weeks 2 days ago
Joined: 04/23/2019 - 01:26
Posts: 110
Location: USA
HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark

Not really, neither the wrapper or button top is original, but I do not know if the battery is original (Probably not).

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

nuemtol
Offline
Last seen: 3 weeks 2 days ago
Joined: 04/23/2019 - 01:26
Posts: 110
Location: USA

Thanks, I’ll save my money

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

nuemtol wrote:
I saw some NCR18650ga on aliexpress I'm curious about for ~$2/ea. Do you have any opinions about them?

https://www.aliexpress.com/item/4000291832886.html

I've seen such top before (BAK 18650-34T), take a look right here. Not a bad cell, but I prefer not feeding bad business models. You can buy BAK 34T cells with a lot less misleading wrapper. For example:

 

https://www.aliexpress.com/item/32960738521.html

 

I think this cell is in Henrik's testing queue or it has already been tested under some spurious wrap. 

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

HydrAxx
HydrAxx's picture
Offline
Last seen: 23 hours 51 min ago
Joined: 08/22/2018 - 09:27
Posts: 115
Location: France, Nantes

Hello HKJ, I suggest you the test of a new cell in format 18500 that I discovered recently and which offers better capacities than those proposed by Sanyo, Panasonic or even more recently the rewrapper “Vapcell”. It is a cell manufactured by YLE (YikLikEnergy) in the format 18500 with a nominal capacity of 2250mAh (and it is not exaggerated!) For a continuous maximum discharge announced at 4 Amps, to see if in reality we can not push to 5A see more … They are sold in pairs what will arrange you I think for a test, here is the link to buy a pair (box provided):

https://www.ebay.fr/itm/2-Pack-2250mAh-18500-Batterie-Reel-Capacite-avec...

Oh yes, I was going to forget the delivery is free for Denmark Wink

Can a single flapping of a butterfly's wings trigger a tornado at the other end of the world?

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

HydrAxx wrote:

https://www.ebay.com/itm/2-Pack-2250mAh-18500-Batterie-Reel-Capacite-ave...

Certainly interesting, HydrAxx. However, being one who among other things is always looking for optimizations, I had to look for alternative sources:

 

Besides a typical overstated capacity rating in the wrap, funny second picture, the guy who made it knew very little about batteries. 

Of course I won't say it is 100% sure both batteries come from the safe factory, but very very likely. Wink 

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

HydrAxx
HydrAxx's picture
Offline
Last seen: 23 hours 51 min ago
Joined: 08/22/2018 - 09:27
Posts: 115
Location: France, Nantes

Personally, i have tested the YLE 18500 2250mAh, their announced capacities are reals but according to the returns I had on “YCDC 18500 2500mAh” they would be 18500 2000mAh with the exaggerated capacity, incidentally there is no official datasheet for “YCDC” while the “ YLE 18500 2250mAh “have an official datasheet as you can see in my post. And yet I’m not a big fan of Chinese manufacturing cells, but this one from YLE are really excellent I must admit, even Panasonic does not do as well.

Can a single flapping of a butterfly's wings trigger a tornado at the other end of the world?

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

Mmmkay but, who is YCDC? These plain orange wraps are far from what any serious OEM would use, and what I was trying to imply is that the “YCDC” cells are probably being manufactured by the same OEM, Changde YikLik Energy, but later rewrapped by a 3rd party who buys cells in bulk from them; maybe lesser grade cells. The cell top is the same, 5 lobes/legs and same shape I'd say. 

It is great to have advancements in other cell formats, but given the above price… Facepalm 

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

Agro
Agro's picture
Offline
Last seen: 20 hours 16 min ago
Joined: 05/14/2017 - 11:16
Posts: 6172
Location: Ślōnsk

Nightwatch uses 26980 cells with supposedly very high current carrying capability.
Would be nice to see how do they fare against 30T…

volchyonok
volchyonok's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 09/30/2018 - 07:30
Posts: 73
Location: nearthesun

Barkuti wrote:
did you ever tested some electronic load like the following?

I have such an electronic load. She is a very good assistant for various purposes. Unfortunately, its power is limited to the level of 150W, but it is advisable not to exceed the power of 140W, so if you check prefabricated batteries with a high voltage (for example, 14S = 58.8v), then the current must be selected no more than 2 amperes. I checked the battery for the electric bike and made a mistake by setting the current to 3A, after which it failed and I had to repair it (the output transistor, Schottky diode burned out and also on the circuit board there was a break in the current path).
HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark
Agro wrote:
Nightwatch uses 26980 cells with supposedly very high current carrying capability. Would be nice to see how do they fare against 30T…

The cell is too long for my standard test rig.

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

volchyonok
volchyonok's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 09/30/2018 - 07:30
Posts: 73
Location: nearthesun

HKJ wrote:
That cell is a problem, it will not fit in my battery holders, 70mm long is about maximum I can test.

HKJ wrote:
The cell is too long for my standard test rig.

Your tests are more like not only a test, but the destruction of elements under currents of various levels. Why do elements on your tests need holders if the vast majority of elements after such checks are then not suitable for sale or normal use? Your tasks are of a completely different nature and purpose. You create invaluable experiments that open up opportunities for all of us to evaluate the behavior of various participants in your tests with their strength tests. Your visual graphic pictures help us a lot to understand and evaluate the behavior of batteries at a wide variety of loads, after which it becomes clear how they can be loaded and how best to not do it. Those batteries that you test, after your tests, can be thrown into the trash, because under your professional guidance they have already completed their main combat mission. With your help, we get evidence about all the possibilities of a particular battery model in order to select the most appropriate elements for certain consumers as competently as possible.
From all of the above, it is easy to guess why for batteries 26800-26950 you absolutely do not need large holders. Using a conventional soldering iron, you can simply solder the AWG wires to their contacts, which can then be connected to your loads for control measurements. It is only necessary to solder without any expensive (home-made or branded) and very rare type of holders. Why are these holders needed, if it is necessary to carry out testing up to the complete destruction of the elements, which can then be simply thrown away, before that only by removing the control AWG wires from them? In addition, holders can negatively add transient resistances that increase at high currents, especially after a load current level of 5-10 amperes, which is not desirable for any of us.

In short, we all look forward to checking out the new 26800 format

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

pietropetris answered a couple questions concerning an NCR18650B wrapped cell here and there, Henrik got a couple cells for review, and later I found another green wrapped cell with the same top. I have to ask because the review of these cells is nowhere to be seen. 

Thanks.

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

Barkuti
Barkuti's picture
Offline
Last seen: 5 hours 48 min ago
Joined: 02/19/2014 - 14:46
Posts: 5151
Location: Alhama de Murcia, Spain

volchyonok wrote:
… the destruction of elements under currents of various levels…
From all of the above, it is easy to guess why for batteries 26800-26950 you absolutely do not need large holders. Using a conventional soldering iron, you can simply solder the AWG wires to their contacts, which can then be connected to your loads for control measurements. …

… the destruction of elements  under currents of various levels. Not really, Henrik could go even further but his battery holder would either not finish due to temperature cut-off at ≈75 °C, or it would Wink melt. I usually find reading your posts quite funny volchyonok, looks to be the translation engine. Did you try DeepL translator?

I am experienced in low temperature soldering of cells, did neat looking drill battery pack restorations with complete success adding some serious current paths. I use Bi50Pb32Sn18, with a claimed melting point of 93 - 96 °C, this means it can serve as cell protection fuse in case of serious overheating. I myself could prepare a few “review elements” with separate side by side current and voltage probing paths, we could see testing at least at twice (or Big Smile thrice) the current 30A limit this way, although sending them to Henrik wouldn't be very cheap.

 

P.S.: A 26800 cell was reviewed by ThunderheartReviews, see Queen Battery QB26800 6800mAh 20A - the big guy!

The Light Innocent I am

Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

HKJ
HKJ's picture
Online
Last seen: 2 sec ago
Joined: 05/24/2011 - 12:23
Posts: 7297
Location: Copenhagen, Denmark

I do usually not destroy cells in my testing, most cells can easily survive that I go a little above rated current, but that is not really the reason for my holders. The reason I use these holders is to get 4-terminal connection to the batteries, this improve the result at higher currents.

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

volchyonok
volchyonok's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 09/30/2018 - 07:30
Posts: 73
Location: nearthesun

Barkuti wrote:
A 26800 cell was reviewed by ThunderheartReviews, see Queen Battery QB26800 6800mAh 20A – the big guy!

The fact of the matter is that we do not need third-party tests, but familiar tables from the HKJ master, by which we can compare some elements with others. And what you show on the links (from a Russian guy with a terrible English accent ThunderheartReviews), I already saw a year and a half ago.
In addition, a test is carried out there with a current of up to 20 amperes, and we need to the maximum possible for HKJ 30A, as well as 40-50 amperes, even if the report on such loads will be outside the main table after the test. Elements at the end of the last test with the highest possible loads should be destroyed and suitable only for disposal in the scrap. This is the only way to truly explore the possibilities of these 26800 or any other powerful element. Therefore, the HKJ master absolutely does not need any holders with their contacts, which only interfere with tests with their transition resistance.

Pages