Efest IMR-26650 4200mah Green

17 posts / 0 new
Last post
Lothar
Offline
Last seen: 2 months 1 day ago
Joined: 10/26/2011 - 11:22
Posts: 389
Location: Stellenbosch, South Africa
Efest IMR-26650 4200mah Green

Do anyone have any info or reviews of these new green Efest IMR-26650 4200mah batteries? Are they the same as the KeepPower IMR-26650 4200mah batteries?

Lothar
Offline
Last seen: 2 months 1 day ago
Joined: 10/26/2011 - 11:22
Posts: 389
Location: Stellenbosch, South Africa

Surely someone has to know something about these batteries? Smile

RMM
RMM's picture
Offline
Last seen: 14 hours 19 min ago
Joined: 07/23/2013 - 13:47
Posts: 3985
Location: USA

I will pick up a few with my next order and see how they perform.  I have a feeling they might just be a re wrapped King Kong, but the only way to know is to test it.

Mountain Electronics : batteries, Noctigon, and much more! What's new? 

TheGloriousTachikoma
Offline
Last seen: 1 year 9 months ago
Joined: 08/22/2013 - 09:23
Posts: 946
Location: Ann Arbor, MI

Re-wrapped king kongs? I thought [as far as batteries were concerned] Efest was on the up-and-up. Or are these outside the normal Efest source?

RMM
RMM's picture
Offline
Last seen: 14 hours 19 min ago
Joined: 07/23/2013 - 13:47
Posts: 3985
Location: USA

TheGloriousTachikoma wrote:
Re-wrapped king kongs? I thought [as far as batteries were concerned] Efest was on the up-and-up. Or are these outside the normal Efest source?

Would there be something wrong if that were the case?  King Kongs are great cells.  Efest does have good cells, but they don't make all of them in house, especially with a lot of the 18650s.  For example, their 16650 is a Sanyo cell.  

Mountain Electronics : batteries, Noctigon, and much more! What's new? 

TheGloriousTachikoma
Offline
Last seen: 1 year 9 months ago
Joined: 08/22/2013 - 09:23
Posts: 946
Location: Ann Arbor, MI

King Kong is a ICR, and that cell pictured is an IMR. King Kongs are good cells but why buy a re-wrapped King Kong?

RMM
RMM's picture
Offline
Last seen: 14 hours 19 min ago
Joined: 07/23/2013 - 13:47
Posts: 3985
Location: USA

TheGloriousTachikoma wrote:
King Kong is a ICR, and that cell pictured is an IMR. King Kongs are good cells but why buy a re-wrapped King Kong?

I guess we don't really know what the King Kong's chemistry is.  Even the high drain LG HE2's product code is ICR18650HE2.  It isn't clear cut anymore since all of the chemistries seem to be a hybrid.  The ICR King Kong performs better under high drain than the INR King Kong.  I think that the simple distinction between ICR and IMR is no longer valid.

Just to make it clear:  I don't know what cell is inside of the Green Efest 26650; it was merely a guess, and an unsubstantiated guess at that.  If it is the same, then no, I wouldn't pay more for it.  

Mountain Electronics : batteries, Noctigon, and much more! What's new? 

led4power
led4power's picture
Offline
Last seen: 33 min 25 sec ago
Joined: 12/29/2012 - 09:48
Posts: 647
Location: Croatia,EU

I think that Efest 4200mAh,Keeppower 4200mAh,Vappower 4200mAh... use the same internal cell because specifications are practically identical.

Lothar
Offline
Last seen: 2 months 1 day ago
Joined: 10/26/2011 - 11:22
Posts: 389
Location: Stellenbosch, South Africa

I will be very excited if these are they same as the Keeppower IMR26650 4200mah. I'm in need of some IMR26650 cells and were considering the Efest IMR26650 3500mah's, but will rather take these if they are the real deal.

RMM
RMM's picture
Offline
Last seen: 14 hours 19 min ago
Joined: 07/23/2013 - 13:47
Posts: 3985
Location: USA

Just as an update to my earlier statement:  I have tested a few of the Green Efest 4200s, and they are not the same cell as a King Kong.  They seem to perform slightly better under a heavy load.

Mountain Electronics : batteries, Noctigon, and much more! What's new? 

SubLGT
Offline
Last seen: 14 hours 18 min ago
Joined: 12/08/2014 - 12:42
Posts: 130
Location: Idaho, USA

Here is a test from a vendor, comparing it to the Efest purple 3500mAh, at 35 amps. It performed surprisingly well.

http://ukvapers.org/Thread-New-Efest-26650-batteries

vestureofblood
vestureofblood's picture
Offline
Last seen: 13 hours 27 min ago
Joined: 08/17/2012 - 15:21
Posts: 1489
Location: Missouri

Does anyone know if a magnet will stick to the top of this cell?

In Him (Jesus Christ) was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.
http://asflashlights.com/ Everyday Carry Flashlights, plus Upgrades for Maglite.

Barkuti
Barkuti's picture
Offline
Last seen: 6 hours 2 min ago
Joined: 02/19/2014 - 14:46
Posts: 1970
Location: Alhama de Murcia, Spain

Efest on the up-and-up? What the hell? Efest is a rewrapper with a sort of an elitist appearance, but a @#$% rewrapper after all. They can decide to change what is inside of the wrap without notice, a very bad practice. And they already have a certain bad reputation for overspeccing some of their sh1te.

And what is more, if they are waiting for me to pay twice the price for one of their inferior products, better tell them to find a comfortable seat and proceed to sit, because it's gonna be a looooong wait (too long LoL!). 

 

26650 Battery Bench Test Results and New Ratings Table @ E-CigaretteForum

That green Efest performed good. But, you know, there are better and cheaper cells.

 

Party

  

vestureofblood
vestureofblood's picture
Offline
Last seen: 13 hours 27 min ago
Joined: 08/17/2012 - 15:21
Posts: 1489
Location: Missouri
Barkuti wrote:

Efest on the up-and-up? What the hell? Efest is a rewrapper with a sort of an elitist appearance, but a #$% rewrapper after all. They can decide to change what is inside of the wrap without notice, a very bad practice. And they already have a certain bad reputation for overspeccing some of their sh1te.</p> <p>And what is more, if they are waiting for me to pay twice the price for one of their inferior products, better tell them to find a comfortable seat and proceed to sit, because it's gonna be a looooong wait (too long LoL!).&nbsp;<img src="http://www.forolinternas.com/images/smilies/cejas.gif" alt="" width="15" height="15" /></p> <p>&nbsp;</p> <p><a href="https://www.e-cigarette-forum.com/forum/threads/26650-battery-bench-test-results-and-new-ratings-table.725452/">26650 Battery Bench Test Results and New Ratings Table E-CigaretteForum


That green Efest performed good. But, you know, there are better and cheaper cells.


 


Party

Thanks for the link. Always love an independent test Smile

Do you happen to know of any of the better cheaper cells that also have a raised top and that a magnet will stick to?

In Him (Jesus Christ) was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.
http://asflashlights.com/ Everyday Carry Flashlights, plus Upgrades for Maglite.

Barkuti
Barkuti's picture
Offline
Last seen: 6 hours 2 min ago
Joined: 02/19/2014 - 14:46
Posts: 1970
Location: Alhama de Murcia, Spain

Wow! What a messup with the quote LoL! 

 

vestureofblood, if willing to attach a magnet over the hollow plus terminal I have to say that, in my experience, there's little problem with the all-the-rage LiitoKala 26650-50A:

 

 

Raised tops may be puny metal sheet casted large buttons spot welded with flimsy nickel tabs over the actual flat top:

 

 

For a clean, ultra-low resistance button top I recommend soldering a wide neodymium magnet, pooling additional solder over the top as a wear and tear reinforcement if required (NdFeB magnets oxidize quickly if their plating is removed). Without aggressive flux this may not work.

A good solder blob is cheap and easy, but not as cool.

 

  

retro31337
Offline
Last seen: 7 months 3 weeks ago
Joined: 04/22/2017 - 22:23
Posts: 1

This guy Mooch does all kinds of tests on batteries, almost all Efest’s are rewraps of other batteries.
Check him out on the ecigarette forum https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

Also check out his facebook page for the latest battery updates. https://www.facebook.com/batterymooch/

Interested in Vaping? Check out the vape blog at https://vapesupplyclub.com

Barkuti
Barkuti's picture
Offline
Last seen: 6 hours 2 min ago
Joined: 02/19/2014 - 14:46
Posts: 1970
Location: Alhama de Murcia, Spain

Related discussion at E-CigaretteForum with regards to my observed delta between HKJ and Mooch discharge curves: https://www.e-cigarette-forum.com/forum/threads/samsung-inr21700-30t-35a-3000mah-21700-bench-test-results-an-incredible-40a-3100mah-battery.798683/#post-19461187

Briefly speaking, Mooch doesn't measures battery voltage right at its terminals, which results in a non-compensated voltage deviation equal to current over sensing leads times sensing leads resistance. Slightly higher effective cutoff, too.