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(17) Purple Efest Batteries not as Advertised

Rating: 4 votes, 4.00 average.
by , 08-31-2014 at 04:46 PM (1259 Views)
Quote Originally Posted by windxrunner View Post
Where are you guys getting this information about Efest batteries being not as advertised? I'm asking for some data that shows they aren't what they are advertised to be.
Dampfakkus is an independent testing facility in Germany which first exposed that Efest is using cells from other manufacturers, rebranding them, and then advertising over-rated specifications as a marketing ploy for better sales of their batteries.

The purple Efest 2500mah 35 amp battery: blogs/baditude/attachments/369933-17-purple-efest-batteries-not-advertised-efest-35amp.jpg
Quote Originally Posted by Dampfakkus
This is a rebranded LG 18650HE2 cell. Careful: max continuous discharge rate for this cell is 20A *NOT* 35A as advertised by Efest. According to LGs spec sheet 35A is only permissible for short periods not to exceed 75 seconds.
Quote Originally Posted by DyVape
The IMR 18650 2500 mAh EFEST announced as 35A continuous discharge, are actually LG cells supporting a peak value of 35A but continuous discharge 20A.

This information is especially important for merchants who sell these batteries. We had already warned (about) the EFEST Purple 2500mAh batteries, announcing whimsical performance, especially in terms of continuous discharge, which can quickly be dangerous under certain conditions of use (low and very low resistance).

The purple Efest 3100mah 20 amp battery: blogs/baditude/attachments/369934-17-purple-efest-batteries-not-advertised-efest-20amp.jpg
Quote Originally Posted by Dampfakkus
This battery is no way able of a 20A continuous discharge!

This cell is advertised as 20A. However it is based on a Panasonic NCR18650BE Which is rated anywhere in between 4A and 6.4A maximum continuous discharge. Performance test results put it on a level in between NCR128650B (6.5A) and Panasonic NCR18650PF (10A) and is doing fine there.
Quote Originally Posted by DyVape
The IMR 18650 2500 mAh EFEST announced for the 35A continuous discharge, are actually LG cells supporting a peak value of 35A, but continuous discharge (of) 20A.

EFEST (has) recurred, this time in a more dangerous (way), announcing in labeling its 3100mAh battery continuous discharge 20A, thus supporting theoretically safely 0.25 ohm coils. Dampfakku showed that these Efest Purple 20A are actually Panasonic continuous discharge cells supporting 4A (!) And maximum (and therefore for a short duration), 6.4A limit for the atomizers in order to vape safely with these batteries is not 0.25 ohm but above 0.8ohm ... which makes a big difference. The cells used by EFEST 3100mAh "20A" are those of the Panasonic NCR18650BE.

Efest 3100mah 20 amp batteries: Warning - these batteries are dangerous.

The purple Efest 2100mah 30 amp battery: blogs/baditude/attachments/369935-17-purple-efest-batteries-not-advertised-efest30amp.jpg
Quote Originally Posted by Dampfakkus
I am very sure this is in fact simply a rebranded Sony US18650VTC4 cell.
blogs/baditude/attachments/369932-17-purple-efest-batteries-not-advertised-efestsony.jpg
[* Excuse the odd grammar in the above quotes. These were taken from Google translations from German or French to English.]

The cells that Efest are re-branding are good quality cells for the most part, But the deception Efest uses to market their batteries is what is dangerous.

People who are buying these batteries for sub-ohm use and expecting them to perform at the advertised spec are unknowingly using a battery with inferior specifications for that use, which could be dangerous by using a battery above its specification limits. The amp ratings that Efest is advertising are dubious and deceptive. Most other manufacturers use the "continuous discharge rate", an accepted industry standard.

Continuous Discharge Ratings vs Pulse (Burst) Discharge Ratings

The "continuous discharge rating" in amps is the standard specification for amp limits within the battery industry. It is a determination made by the manufacturer and represents the amp limit a battery can be safely used before it will fail.

The "pulse or burst" discharge rating is not a specification standard within the battery industry. Every manufacturer or vendor seems to have their own definition of what the pulse rating is.

A pulse discharge rating is any use above the continuous discharge rating. It is never safe and not within the intended operating parameters of the battery. You should not operate your device above the continuous rating if you can help it.
The pulse rating is a condition in which the battery is on basically a buildup to failure. It is exceeding the sustainable and intended discharge rate of the battery. It is inappropriate for a consumer device to operate in the pulse range of its battery.

Which would be why we shouldn't rely on any pulse rating. Any failure, mechanical or electronic, that fires the mod will operate in the 'continuous' mode. If your setup relies on a pulse rating, it's instantly over spec.


If your amp draw is safely in the continuous discharge range, your coil could act almost like a fuse and burn out before the battery is stressed. If you are already running the battery at the edge of it's limits (pulse), there is no margin of safety.
KY_Rob, lamarrk, RCHagy74 and 5 others like this.

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Comments

  1. QBass's Avatar
    Well, this is a timely post. I have a few purples in my ebuy watch list and was considering making a purchase very soon. Perhaps I will reconsider for now and continue with my homework.

    Thank you very much for the heads up, 'tude!
    Baditude likes this.
  2. tallguy0821's Avatar
    Props to the little tidbit at the bottom of pulse vs. continuous discharge. I was wondering about that right around the time I scrolled down to it. Thank you baditude for being my battery safety tutor. What are your sources for your battery information, if you don't mind me asking?
    Baditude likes this.
  3. Susan~S's Avatar
    Thank you! I will add this to my growing list of links you keep churning out.
    Speedracer12 and Baditude like this.
  4. Baditude's Avatar
    Quote Originally Posted by tallguy0821
    Props to the little tidbit at the bottom of pulse vs. continuous discharge. I was wondering about that right around the time I scrolled down to it. Thank you baditude for being my battery safety tutor. What are your sources for your battery information, if you don't mind me asking?
    A lot of online internet seaches, including tidbits from ECF and Battery University. Google search is my friend. Many of my resources are listed as footnotes at the bottom of my blogs.
    Battery Basics for Mods
    Deeper Understanding of Mod Batteries
    Information Resources for Your First RBA
  5. Marc411's Avatar
    Always informative and educational Bad!

    Thanks.
    Baditude likes this.
  6. Terren505's Avatar
    My ex-roommate is lucky that it didn't fit his mod then. He would have had a bad time running his low ohm setup.
    Baditude likes this.
  7. Speedracer12's Avatar
    You can learn more reading your blogs then in the million posts on the forum. Thank you, as I know little about rechargeable batteries.
    Baditude likes this.