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Bench Test Results: EHPRO/Bootes Yellow-Black 3000mAh 60A 18650...only a 20A-25A battery, DO NOT BUY

Discussion in 'Batteries and Chargers' started by Mooch, Mar 10, 2018.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These tests below only note the estimated ratings for these batteries at the time I tested them. Any battery that is not a genuine Samsung, Sony, LG, Panasonic, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.

    Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition.

    Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.

    If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.

    14C36E71-61D7-41BE-8D79-9D3E37EFDCB1.jpeg 639EEA80-822D-4F02-9061-0639EE8EC8C5.jpeg E1F3DBA1-BA43-4D85-AB96-39A38F8D912E.jpeg 24312A58-92B1-41E6-A384-DC622D175CA3.jpeg


    Bottom Line
    EHPRO/Bootes (not the EHPRO e-cig company) markets this cell to vapers but their web site clearly states it’s not meant for use with e-cigarettes and that it is a serious misuse of the cell. We’ve seen retail vendors do this, it’s just a standard liability statement, but when the battery wrapping company does this with their own cells then is it done at our expense?

    What should we do when a company is willing to sell us something, pocket the profits, and then say not to use what we bought? If you didn’t buy direct from their web site you’d never know they say not to use with e-cigs. Just something to consider. This is different than what Sony and LG do as they do not market to vapers and they actively try to keep us from using their cells.

    Since EHPRO/Bootes does not want anyone to use this cell with any vaping device I am giving it a Do Not Buy recommendation.

    On the wrap, in the tiniest lettering I’ve ever seen on a cell, it says it’s rated 35A continuous and 60A “max pulse discharge”.

    Unfortunately, the 35A continuous rating is greatly exaggerated. This EHPRO/Bootes cell appears and performs identically to the 20A-25A Sony VTC6A.

    I haven’t seen the datasheet for the VTC6A to know Sony’s ratings but EHPRO/Bootes’ claim of 35A is ridiculous. At that high a discharge current level this cell becomes hot enough to boil water. The VTC6A might have a temperature-limited rating that high but you must stop the discharge before the cell reaches 80°C. This means it cannot be a continuous current rating.

    The 60A EHPRO/Bootes’ “pulse” rating is useless.

    Any “max”, “pulse”, or “max pulse” rating is useless as we don’t know the pulse length, time between pulses, and the criteria they used to set the rating (temperature? voltage sag? cycle life? A combination of those or other things?). We’re not able to compare this cell’s pulse rating to any other’s.

    I am rating this EHPRO/Bootes cell at 20A-25A and 3000mAh for any non-vaping use.

    Two cells were donated for the purposes of testing by EHPRO/Bootes (Shenzhen EHPRO Battery Technology Co., LTD |). Thank you!


    Continuous Current Discharge Graph
    529BDF00-75A8-42BA-84EF-A63892AF7F0E.jpeg


    Ratings Graphic
    E811F2D5-6982-426C-8EE7-98361755C349.jpeg


    EHPRO/Bootes warnings against e-cigarette use
    2CD2643F-5CF5-4DD7-A386-FD971D4786B4.jpeg 85806B89-FE01-488C-9431-EDB1766B9622.jpeg

    To see how other cells have tested check out this link: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/
     
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  2. untar

    untar Ultra Member

    Feb 7, 2018
    Germany
    Did they pirate the EHPRO brand? If they're just piggybacking on the name nobody should buy anything from them under any circumstance, especially since batteries are relevant to our safety.
    Thanks for the tests!
     
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    • Agree Agree x 1
  3. Rossum

    Rossum Surly Curmudgeon Verified Member ECF Veteran

    Supporting member
    Dec 14, 2013
    NE FL
    It would seem that way:
    There are two EHPRO companies!

    Although the reality is that the original EHPRO built its business by cloning Kayfuns...
     
    • Agree Agree x 2
  4. untar

    untar Ultra Member

    Feb 7, 2018
    Germany
    Tbh I'd rather have a cloned atty swimming in machining goo and metal chips than a battery that fires said clone through my skull :D
     
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  5. stols001

    stols001 Mistress of the Dark Nicotinic Arts Verified Member ECF Veteran

    Supporting member
    May 30, 2017
    Tucson, AZ
    Thanks for the testing and upfront information as always, Mooch :)

    Anna
     
    • Agree Agree x 2
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