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I am writing this post as Efest batteries have been recommended to me a few times, but they are not what they seem. They don’t actually make their own batteries, they just re-wrap sony,samsung, LG and panasonics.
The Efest MAH 20AMP for example is actually around 9-10 amp continuous discharge( depending on the rewrap, some have been as low as 4 )! This might be OK in a torch, but I also vape, and regularly draw 17+amps, so they could go into thermal runaway due to this, and we know that is a very, very bad thing.
The efest MAH is actually B and C grade panasonic NCRBE and NCRBD batteries re wrapped by efest, BE’s are rated at 4AMPS continuous discharge, while the BD’s are rated at 10AMPS continuous.
The NCRBE 4 AMP batteries are no longer made, so are old B and C grade stock, which you can buy for around $4.
The NCRBD is in production and can be purchased for around $7 each, and they are A grade batteries, not rejects.
Hope this helps someone in someway, even if its just to let you know Efest are not very good to go for as they are B and C grade cells probably are not rated at what they was meant to, thats why they was rejected(Most likely with the NCRBE as they was meant to be MAH, they would of been B grades at MAH) or if your lucky a C grade BD with 10 AMP discharge, and help you save some money.
You are much better sticking with Samsung, sony, LG, sanyo, panasonic, than re-wrappers of B and C grade batteries (Not all re wrappers use B and C grade, some rewrap with their own logo and just charge more money for the battery).
http://www.planetofthevapes.co.uk/forums/ecig-discussion/general-chat/-efest-are-at-it-again--mah-20-amp-actually-4amp-rated-6-5-pulse-panasonic.html one example.
No, Efest are well known in the vaping community as a brand to stay away from, as they only rewrap and don’t manufacture their own batteries. They may be OK in torches, but people can save money (and safety) by buying from the actual manufacturers.
Here is the info on the MAH batteries http://www.planetofthevapes.co.uk/forums/ecig-discussion/general-chat/-efest-are-at-it-again--mah-20-amp-actually-4amp-rated-6-5-pulse-panasonic.html and just some more info on the re wrapping Any experience with the mAh purple Efests? | E-Cigarette Forum
It is generally cheaper to find what battery Efest re wraps for that particular battery, and then buy that actual battery usually at a saving from the original manufacturer.
I know because I am new here it probably wont be believed, but I have vaped for quite a long time so know my ’s. Information about Efest being re-wraps is available all over the internet, with people running tests on them and determined they was the Panasonics( MAH, others capacities are LG, Samsung or old sony VTC’s.)
I have heard of them before. I would think they are legit.
I realize that just One[1] example does not cut it!! I can tell based On HKJ’s “Comparator” I chose the Efest IMR 700mAh FT “V1” over the Button Top version. I was surprised how much better the voltage curve was for V1.
The link you provided substantiates HKJ’s findings in regards to run time. HKJ’s shows this[slighly better run time] along with a surprisingly better voltage curve for V1.
_
Dampfakkus link:
EFest IMR -700 ButtonTop V2 700mAh 556mAh
EFest IMR -700 FlatTop V1 700mAh 650mAh
Like anything else I believe this can give us a general example.
On the other hand[skeptics side] there are so many variables. How many samples were used? Every battery can be different and we can never know what get until we get it!!!
I think avoiding a certain battery brand because they rewrap is beyond extreme, should I say absurd. Even the name brands from some big Asian cell maker, when sold as "protected", are generally what I would call third-party rewraps. Even worse as the third party might remain unknown, which is at least not the case with reputable rebranding.
The significant issue with rewrapped batteries, as you have stated, is identifying the cell inside(and possibly the protection circuit inside, and inspecting the wrapper quality which is another short circuit risk).
Both types might be fakes, and unsuspecting buyers could fall for these. I'm mostly paranoid about my new batteries no matter where I bought them.
I have a few different purple and red efests, and they are known to be overrated (purples re: discharge spec and reds capacity-wise typically). It seems quite obvious - given the relative affordability and huge 3.1 Ah nominal capacity - that they won't manage proper discharge at anywhere close to 20A continuous.
My pre-purchase evaluation is mostly based on third-party tests such as HJK. I'm aware that this might result in unknowingly overdriving the batteries beyond mfg specs when the cell type remains unknown. Oh well, I do that on purpose, too.
Having said that, I don't generally use Efests for vaping purposes.
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Why would someone doubt any of this? Even the details you give here seem to be in line with battery basics. Most li-ion battery brands are "rewrapped". After all, there are a few dozen known battery brands, probably hundreds in total, and only a handful of significant cell manufacturers. You just pretty much named them except Sanyo.
Why is avoiding a rewrap and paying more to have a different name on exactly the same battery absurd may I ask? Especially when some of the models lie of Amp draw and are dangerous?
I was enjoying my stay here, but thought I would let people know they are just B and C grade, DANGEROUS re wraps(Claiming 20 AMP when it gives out 4 is dangerous)
I am a member of another forum who are aware of efest and would not recommend them, they also have a vaping section, so I will probably use that more, as I said I was enjoying this forum. If you like paying more for rewrapped batteries that cost twice the price, that are also unsafe in certain devices, more fool you.
Thermal runaway next to your face is a serious thing, which is why I will never buy from a company that lies to its customers when it comes to safety.
I never said that. Avoiding a battery just because there's for example "Keeppower" printed on the wrapper instead of "Panasonic" visible through clear wrap would be pointless. Paying extra for the different color wrapper(unless it's better itself) would be pointless. I'm proposing neither.
Members of the budget light forum buy lots of stuff that are marketed with lies. Not just battery capacity or current draw, but exorbitant lumen figures and ridiculous promises of runtime.
These become dangerous when the user is uninformed. Yes, mislabeling batteries is unethical. But the reasoning to avoid a particular brand was rewrapping itself, wasn't it?
Yes, mislabeling batteries is unethical. Efest are known to do that, for example with the "35A" mAh purple that actually is rated for 35A for a minute(or so) and 20A continuous. Or the red that says 800 and only has 500 mAh(no surprise when competing more expensive brand only claimed 700 and had 600).
However, this particular example seems somewhat exaggerated and perhaps forged. My guess is someone failed to recognize a fake, or had a cause against a particular company.
Straw man, eh? It's kinda irresponsible to buy gasoline as that might be dangerous when refuelled into a diesel truck.
“I think avoiding a certain battery brand because they rewrap is beyond extreme, should I say absurd.” My issue is not the re wrap, but the lies, and accidents do happen because of these lies.
I get heated quickly due to a brain injury, also affects my short term memory, so I apologise for earlier and getting a bit vexed.
I just can not support a company who tells dangerous lies, say it was the MAH or something I probably would be annoyed, but thats forgiveable. I can not support a company that advertises 20 AMP continuos when in reality it is either 4, or at best 10.
I have seen the charts showing a Efest MAH is a panasonic, curves as exact as they could be with small differences as to be expected.
Although, the purple efest ‘20’ argument was quite a while back, they may use a better battery now.
Pilotdog68 your probably right, that was what I really could not understand, I was being recommended batteries that I have heard multiple thermal runaways occuring due to, so it got to me a bit more. I stated earlier my actions are affected and I have memory issues, so I apologise If I offended anyone.
I did go over the top a bit, but I couldn’t understand why they was being recommended when I want something I can use in my vape AND my flashlight to save money as I already have them. I think LG make some good High draw batteries now with a higher MAH, so may go for some of them.
There might be several batches. At least the flat top remained above 2 Ah up to 20 A, and remained quite solid up to 10A:
http://lygte-info.dk/review/batteries/Efest%20IMR%mAh%20(Purple)%%20UK.html
This is far from suitable for 20A discharge, but is it really identical to a specific 4-6 A rated cell? I vaguely remember seeing the comparison between purple flat and button tops and they were different. Can't remember where or find those graphs now.
Edit: I can see how this could be identical to a 10 A Panasonic. But is it really confirmed that mixed cells were used?
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