Dolidada cells with low capacity and an inaccurate Zanflare C4

65 posts / 0 new
Last post
Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

Guys…thanks a lot for your help! I’m afraid things are now even more complicated than originally expected…

Yesterday, I did an additional NOR test (C-D-C cycle) on three Samsung 35E and one Sony VTC5A…all of them are flat tops. The 35E has a nominal capacity of 3.500mAh, the VTC5A has 2.600mAh. Now, if you have a look onto the picture below it becomes clear that the Zanflare C4 is “a bit high” on all cells I have charged so far. The charger was in stage 3 of the C-D-C cycle when I took the picture revealing the capacities. iR readings were collected before.


That takes me to following conclusion:

  • My Zanflare C4 is absolutely inappropriate for measuring battery capacities, not only because it indicates too high values but also because slot #2 always indicates around 75-150mAh more than the other slots. It makes me wonder if it’s just counting wrong or if the device really “over-dis-charges” the cells. I doubt the latter case but how can I be sure? However, the device appears to stop discharging at 2.8V and charging at 4.20V as it is meant to be.
  • Most probably, my C4 is not a “faulty” one but more likely the product itself seems to have some kind of a design flaw when I compare my results with HKJ’s statement that measured capacities are “a bit on the high side”. I muss confess I was not aware of the right meaning when I read it first, so I still bought this device. However, iR readings seems to be fine as you can see on the secound picture.
  • Now, taking into consideration that all 18650 cells probably indicate too high values (up to 10% more on slot #2) it puts the Dolidada – the name reminds me in a fittingly way of dadaism by the way – into an even worse light. The actual capacity at 0.5A discharge current could be more around 4.700mAh instead of 5.000mAh – while the shrink label lets you think you bought a 5.500mAh cell. If you have received high dran KP cells with 5.800mAh under the same Dolidada brand in the past you’ll be even more surprised.

So, now I have mixed feelings about both the charger and the Dolidadas. There is no way to recalibrate the C4 to correct values, is there?

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196
light-wolff wrote:
Your C4 results clearly show that either the charger delivers more or less random results or the cell are not genuine 30Q. The values are too high, and the variation between cells is also too high. I would not trust these “measurements”.

Danke Dir light-wolff! Those 30Qs were from NKON which is to my mind a trustworthy reseller from the Netherlands. So, as I stated above this post – the charger seem to be inaccurate.

tatasal wrote:
FlashTom wrote:
I will test these cells again in the MC3000 and discharge them down to 2.5V.

For a fair comparison, I suggest to set it at 2.80v, same as the C4’s terminal voltage cut-off.

Thank you, also for checking your 30Qs capacity for comparison. I will repeat the test with my MC3000 and report back.

Lightbringer wrote:
Exactly, which is why he should just contact Didgeridoo directly and ask them nicely what’s going on, then hear what they have to say, and hopefully offer. A few bux back makes them cheaper. Extra/Replacement cells means getting more cells. Either way it’s a win/win, just for asking. And it kinda puts them on notice that people can ask for what they paid for, even if “discounted” in price (ie, “getting a deal”) or exaggerated claims.

If they get bit a few times, it’d pay for them to list them more honestly at 5000 and have people be happy they got better-performing cells, instead of 5500 and feeling cheated.

And if not, p&m to AX and let them whap them into line.

Thanks Lightbringer! Your comment made me start to smile…“Didgeridoo”…haha. Big Smile Yeah, I’m gonna ask the seller about his opinion. I just need to eradicate all the other variables in the equation before (i.e. to assess the capacity in the MC3000 for comparison). According to the charger I’m not sure how to proceed. If I ask Gearbest they would – in the best case – probably just send me another inaccurate C4 charger.

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

I have just revised the topic description. I hope nobody minds. Wink

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East

Are those numbers in the photo Discharge Capacities?

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

tatasal wrote:
Are those numbers in the photo Discharge Capacities?

Yes.
Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

I just learned that I am not the only one having these issues with the C4…

http://budgetlightforum.com/comment/1276343#comment-1276343

ifratos
ifratos's picture
Offline
Last seen: 1 week 3 days ago
Joined: 07/31/2017 - 07:19
Posts: 152
Location: Romania

…as a result of all comments ordered 5 dolidada for $18.59 .Good price for 5000mAH battery and the name it’s so beautiful.
I will test with my original Lii-500.

And God said, Let there be light: and there was light.( Gen.1:3)

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East
ifratos wrote:
…as a result of all comments ordered 5 dolidada for $18.59 .Good price for 5000mAH battery and the name it’s so beautiful. I will test with my original Lii-500.

If they change their name to ‘ a do do do, a da da da ‘ … I’ll order 5 more, promise!

ifratos
ifratos's picture
Offline
Last seen: 1 week 3 days ago
Joined: 07/31/2017 - 07:19
Posts: 152
Location: Romania

or Oblady oblada for Beatles fans Smile

And God said, Let there be light: and there was light.( Gen.1:3)

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East
ifratos wrote:
or Oblady oblada for Beatles fans Smile

Hahahaha, you just made my day! Thumbs Up Beer

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196
tatasal wrote:
ifratos wrote:
…as a result of all comments ordered 5 dolidada for $18.59 .Good price for 5000mAH battery and the name it’s so beautiful. I will test with my original Lii-500.

If they change their name to ‘ a do do do, a da da da ‘ … I’ll order 5 more, promise!

I love this song… Love

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East

Oh shucks..I have forgotten and just realized that that song was sang by Sting!

Will listen to it again….

ifratos
ifratos's picture
Offline
Last seen: 1 week 3 days ago
Joined: 07/31/2017 - 07:19
Posts: 152
Location: Romania

Sting was singer for The Police

And God said, Let there be light: and there was light.( Gen.1:3)

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East

I have concluded my Discharge test using my iCharger of a 30q after 14h, 07min. Capacity: 2,860mAh @ .20a — photo in post # 11

snakebite
snakebite's picture
Offline
Last seen: 1 week 3 days ago
Joined: 11/20/2013 - 20:21
Posts: 2057
Location: dayton oh

from what i see peeking up from the + end those look like the ebl 5000 i got a bunch of.
every one was above 5000 after 2-3 cycles.
but the results with your 30q’s leads me to believe that analyzer is inaccurate.

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East
snakebite wrote:
but the results with your 30q’s leads me to believe that analyzer is inaccurate.

That’s my long-time observation too….when I started in this hobby almost 6 years ago, I started out with laptop pulls only, no analyzing chargers then, the reason why I got the iCharger (and the Pila IBC and Maha C9000) at that time.

I remember that the only time a cell rating had actually reach or exceed by a bit its mAh rating on the lable from reputable manufacturer is when I set my iCharger to discharge down to 2.50V.

Barkuti
Barkuti's picture
Offline
Last seen: 6 hours 53 min ago
Joined: 02/19/2014 - 14:46
Posts: 5564
Location: Alhama de Murcia, Spain

Innacurate cheap analyzing chargers? Welcome to the real world fellows. The current sense resistors used by these devices feature 1% tolerance, let's just start with this, and there are more variables over the table. I believe my Lii-500 measures close to 2% less, based on my observations for various cells.

 

Cheers Smile

 

Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.

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

I recommend saying no to Covid vaccine. Listen to your soul. Innocent

Keanu Reeves may need your help. Join his Telegram channel here.

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

I wrote an honest review about the Zanflare C4 on Gearbest’s website. After that, their customer service team contacted me in order to solve the issues I have with my device. I explained in detail about the high deviations concerning the capacity measurement incl. the fact that charging slot #2 always indicates much more than the other slots.

So…eventually, this is what Gearbest calls “problem solution”. Thank you very much! Facepalm

———————————————————————-
Dear Thomas,

Thank you for your patiencer.

This charger comes with a volume detection function. Voltage accuracy deviation 2%; Current accuracy deviation 5%; Time accuracy deviation 1%. The capacity is tested by charging voltage, current, and time calculations. Due to the fact that it is not a special compartment, the current market can only achieve a 10% accuracy deviation.

The use of interference Including factors: such as the ambient temperature, humidity, battery type, if the battery installed contacts are good or not and so on. For example, if use different brands of the sub-capacity tester to test, there will be some deviations.

Thank you for your understanding.

Best Regards
*****
Gearbest Customer Service
http://www.gearbest.com/
————————————————————————-

ifratos
ifratos's picture
Offline
Last seen: 1 week 3 days ago
Joined: 07/31/2017 - 07:19
Posts: 152
Location: Romania

Received my 5 Dolidada’s looks very nice Smile , firsts two of them is allready in my Lii-500 for test.

And God said, Let there be light: and there was light.( Gen.1:3)

teacher
teacher's picture
Offline
Last seen: 2 years 2 months ago
Joined: 02/23/2016 - 19:04
Posts: 9596
Location: NE & SW Alabama

Sting…… this is one of my all time favorites by him!!
.


.
No battery, charger, or light content whatsoever. Wink

But fond memories……..

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

 .................................. "Slow is Smooth, Smooth is Fast" ...................................

       Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$  

         Rudeness Level _ mΩ _ {width:70%} _ LightWiki _ LED Tint Chart  

      Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help???            TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal 

 

                                             

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

Well…talking about having faith in Zanflare’s C4 I’d rather listen to this today…

tatasal
Offline
Last seen: 1 hour 37 min ago
Joined: 02/15/2012 - 08:40
Posts: 5653
Location: Far East

Excellent choice from Sting’s collection! Enjoying it now….

teacher
teacher's picture
Offline
Last seen: 2 years 2 months ago
Joined: 02/23/2016 - 19:04
Posts: 9596
Location: NE & SW Alabama

/\ .. Thumbs Up

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

 .................................. "Slow is Smooth, Smooth is Fast" ...................................

       Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$  

         Rudeness Level _ mΩ _ {width:70%} _ LightWiki _ LED Tint Chart  

      Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help???            TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal 

 

                                             

ifratos
ifratos's picture
Offline
Last seen: 1 week 3 days ago
Joined: 07/31/2017 - 07:19
Posts: 152
Location: Romania

My results:

Opened dispute!!!

And God said, Let there be light: and there was light.( Gen.1:3)

Lux-Perpetua
Lux-Perpetua's picture
Offline
Last seen: 2 days 15 hours ago
Joined: 03/01/2018 - 04:39
Posts: 3196

ifratos wrote:
My results:

Opened dispute!!!

Please keep us updated about the dispute. I assume voltage will drop significantly when you use 10 or 15 amps on these cells.

ssschen
ssschen's picture
Offline
Last seen: 2 months 1 week ago
Joined: 09/10/2017 - 22:11
Posts: 375
Location: Australia

Just sharing the tested capacities on the 5x Dolidada 26650 batteries I bought a few months ago from this AX listing. I thought US$19.xx for 5x 26650 batteries is a very good price at the time.

These were all tested using 0.5A on a Zanflare C4 when I first received these batteries in late May 2018.  I was initially quite disappointed with these results, as there were reports these batteries had measured capacities closer to 6000mAh.

Battery #1 & 2

Battery #3 & 4

Battery #5

ssschen
ssschen's picture
Offline
Last seen: 2 months 1 week ago
Joined: 09/10/2017 - 22:11
Posts: 375
Location: Australia

I repeated the same measurement (0.5A) on my Liitokala Lii-500, which yielded even lower capacities!!

Battery #1

 

Battery #2

Battery #3

Battery #4

Battery #5

Barkuti
Barkuti's picture
Offline
Last seen: 6 hours 53 min ago
Joined: 02/19/2014 - 14:46
Posts: 5564
Location: Alhama de Murcia, Spain

Bad, quite bad Dolidada.

I recently discovered that my Lii-500, on the other hand, is quite accurate with regards to capacity testing:

 

 

As things are now, it seems like the available production of PLB 5500mAh cells is not being used by Dolidada, LiitoKala or whatever cheapass rewrapper.

 

Party

Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.

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

I recommend saying no to Covid vaccine. Listen to your soul. Innocent

Keanu Reeves may need your help. Join his Telegram channel here.

ssschen
ssschen's picture
Offline
Last seen: 2 months 1 week ago
Joined: 09/10/2017 - 22:11
Posts: 375
Location: Australia
Barkuti wrote:

Bad, quite bad Dolidada.


I recently discovered that my Lii-500, on the other hand, is quite accurate with regards to capacity testing:


 



 


As things are now, it seems like the available production of PLB 5500mAh cells is not being used by Dolidada, LiitoKala or whatever cheapass rewrapper.


 


Party

Any reason why the end voltages are 3.17V and 3.21V, as opposed to 4.2V?

Pete7874
Pete7874's picture
Online
Last seen: 1 min 15 sec ago
Joined: 11/23/2011 - 16:47
Posts: 3471
Location: USA

ssschen wrote:
Any reason why the end voltages are 3.17V and 3.21V, as opposed to 4.2V?
The cells were likely still being charged back up when he took the photo.

Pages