Story about Efan/Eizfan battery QA, Beaware!

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SJT
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Story about Efan/Eizfan battery QA, Beaware!

Here is a little story about Chinese battery vendor that seems to underestimate the importance of quality control bad time. I wanted to share this with everyone since they won’t answer to me and we can’t get these problems solved and QA fixed (first they told to refund 1/3 and it was not even 1/3 really, now that we have lot more problems with these they won’t answer to any questions). I also want to warn because they sell high current batteries for Vaping. If they are such bad quality batteries also (with that QA, i wouldn’t be suprised…), i’m afaraid something bad could happen someday. So please, if you use Efan battery, read this and check that yours battery is ok.

I have bought now few times these Efan/Eizfan batteries from China, mostly because price is very competitive and they seems to use really genuine Panasonic/Sanyo cells. Unfortunately all the times there has been something wrong with orders. Usually it has been just something with specifications, like PCB should handle much more constant current that it does, or low voltage cut-off was not 3.0V as i was told but it was 2.5V (that is ok though, it is just that why you promise different).

Well, these wasn’t that bad problems, i can leave with those specs now that i know how they really perform.

In first order (at the end of 2012) i got batteries that could handle only ~3A constant current, even though i was told that they perform just like Keeppower, in that time it was something like ~6-7A.

In second order button top versions did handle ~5-6A but flat top still only ~3A. So different protection in flat top and button top for some reason.

I got one battery in that order which was DOA (It was PCB faulty, one defective battery, not that bad) and one battery did look very strange. Picture here:

Well, i had to take off that wrap to see what has happened. It was rusty, i was very amazed.

If i remember correct, they just said they can send me replacement in next order. I accepted that. Meantime i was just thinking, how this can happen, where is QA.

Third order was quite ok, i don’t remember any problems except that lenght was now 1mm more than last order. I was happy, at last we got quality batteries with decent specifications.

Fourth order was totally disaster. After waiting about week, i got information that batteries are ready to ship and i got image about those. They were without any label, even we agreed that there must be labels with real specs, CE and RoHS etc. I was really confused why these won’t have labels and i didn’t agree that. They told me they will add labels. Well that was good, no problem then.
Finally when i got these, problems start straight.

First of all, they were so thick that they couldn’t fit to any Convoy flashlights, so something has now changed since old ones i had no such problem. First battery i looked did show some scratch under wrap. Well, i thought i have to look what it is and is there explanation for this thickness. Well, this time there was Sanyo wrap under, old batteries were without original wrap, only clapton tape, so it won’t be that thick. But also there was scratch on Sanyo wrap and it was quite dirty, picture here:

I asked about this and they said it is ok because it is under that black wrap. I was confused about that answer, no this is not ok, are they used or how that can look like this. They just say, it is ok, no problem…
Well, then i got one battery that was ~3,0V but won’t charge. Again, i take wrap off to see what has happened. And now i was very confused, how is this possible… Picture here:

There was no wrap at all this time, neither clapton tape, so it was shorted badly. How can anyone send battery like this to customer… Again very bad QA.


Here is third battery that was scratched under that black wrap, i don’t understand how in new batteries there is such scratches:

Looks like there is no any QA at all.

Here is pictures about 26650 batteries:




There is sad thing that they are quite thick also and that minus side has this very sharp point. Same problem is with 18650 (about 1/2 of those). It won’t last long that is sure. And also two of these got scratch on wrap out of box. One of these came 0V with PCB and 0,4V without PCB. Don’t know what has happened with this one, but definitely not good thing. But it did perform better than cell which was in correct storage voltage, as we can see on next chart. Very strange.

Then little bit measurements. Here is test with and with out PCB:s and compared to Keeppower 3500mAh. As we can see, PCB used in these Efan version is not that good. Voltage drop is huge IMO. Also we can see that Efan 5500mAh are not even close that 5500mAh. At 1A discharge it was about 4400mAh.

Efan and Keeppower 18650 3500mAh

Efan 26650

Here is also thermal images at the end of test, Keeppower stays little bit cooler here.
Keeppower

Efan

This is my opinion: do not buy these if you are looking quality batteries and well handled after sale support. I prefer now on Keeppower and maybe i will test these Kaidomain versions also which looks pretty good in specs.

I bought these from:
Shenzhen Yifang Technology Co, LTD
Websites:
www.sz-worldsales.com
www.yifangpower.com
Contact person Eileen

It would be nice to share experiences with other users, has anyone bought these?

Edited by: SJT on 01/22/2017 - 10:49
Nicolicous
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thanks for the share.

this seems scary. I only purchase batteries from Banggood which is reliable source but they do screw me around giving low capacity version rather the one i paid.

Nico -.-

desmondkun
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Thanks for sharing.

Normal people would stop ordering since the second time. Good thing, not any serious acccident happened.

Take care of your flashlight and your flashlight will take care of you.

crz6662
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Don’t think I’d be buying anything from them, period…

Speed4goal
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Looks like they salvage used cells that are still decent capacity and rewrap them. Did you ever check capacity of the 18650 and see if its even close to stated specs. If you did I may have missed it above

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djozz
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Thanks for posting, those are batteries to avoid!! It would be useful to post this in leading vaping forums as well.

SJT
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Nicolicous wrote:
thanks for the share.

this seems scary. I only purchase batteries from Banggood which is reliable source but they do screw me around giving low capacity version rather the one i paid.


Well, yes. Smile

I havn’t bought batteries from Banggood, only some flashlights and other electronics. So far no problems with them. Thumbs Up

desmondkun wrote:
Thanks for sharing.

Normal people would stop ordering since the second time. Good thing, not any serious acccident happened.


Thats true. But since there was no any other “real” problems than this one rusty cell (well, maybe that should be enough though…), i was hoping we get specs solved, like we actually did. Cells were normally good, no any signs of damage etc, capacity was good, overall quality was nice to me.
crz6662 wrote:
Don’t think I’d be buying anything from them, period…

Same here!
Speed4goal wrote:
Looks like they salvage used cells that are still decent capacity and rewrap them. Did you ever check capacity of the 18650 and see if its even close to stated specs. If you did I may have missed it above

Actually they seems to be new and authentic in every way. Everytime i measured capacity, cut-off voltage and current handling. Also i did unwrap at least one in every order and they were nice and clean. But last order they were not… Sad
Even these last order cells seems to be new if i measure capacity as you can see on these charts. I measured 3658mAh at 0,2A discharge which is pretty good i think.
SJT
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djozz wrote:
Thanks for posting, those are batteries to avoid!! It would be useful to post this in leading vaping forums as well.

Yes at least now, looks like they lost QA for some reason…

That would be good idea, it’s just i have not registered so far to any of them. If someone put link to any vaping site, i appreciate, please also give me information too if possible.

sac02
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Is there really THAT much money to be saved ordering from sketchy third-party rewrappers, or unknown “manufacturers”?

Samsung 30Q or Panny NCR18650B are both available for about $4/cell in small quantities (1-10pc) and even less in large quantities.

Why even mess around with places like this in the first place?

I’ll gladly pay the extra $1/cell to get a name brand battery that won’t explode in my pocket or in my charger.

But thank you for exposing this bad company – I make sure to stay extra far away.

SJT
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sac02 wrote:
Is there really THAT much money to be saved ordering from sketchy third-party rewrappers, or unknown “manufacturers”?

Samsung 30Q or Panny NCR18650B are both available for about $4/cell in small quantities (1-10pc) and even less in large quantities.

Why even mess around with places like this in the first place?

I’ll gladly pay the extra $1/cell to get a name brand battery that won’t explode in my pocket or in my charger.

But thank you for exposing this bad company – I make sure to stay extra far away.


Well in that time i firstly ordered from them (at the end of 2012), there was no shops that sold even close at that price for “larger” quantity, or at least i couldn’t find. Sad

Now there is much more sellers and really quality batteries out there, but still price goes around 8-10$ after shipping. And i mean with protected batteries, i prefer protected cells in flashlights still even though new Panasonics should be very safe nowadays.

Mr.Scott
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SJT,

Thanks for the information and the warning.

I am going add a link to this thread from the Lithium-ion battery safety thread.

SJT
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Mr.Scott wrote:
SJT,

Thanks for the information and the warning.

I am going add a link to this thread from the Lithium-ion battery safety thread.


Thats good idea, thanks!

It would be very nice to see some Efan “own” IMR cells reviewed and wrap removed. And so that it is not bought directly from them.

mapache
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That’s a shame about the lack of QC, the reviews of the purple 18350 looked pretty good.

SpaceCowboy
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Efan, Efest, AWT = All the same

You never know what you going to get.

https://www.youtube.com/watch?v=en8×80l-cvw