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Bench Test Results: Imren Gold 25A 3750mAh 21700...accurately rated but useless “max” rating

Discussion in 'Batteries and Chargers' started by Mooch, Jul 6, 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.

    987BAF30-2E5D-4A03-BAC4-537C62141873.jpeg 847C833E-E6F7-4C2C-9AD2-B2A577AD4CC9.jpeg B489133B-A8F4-46B1-BE39-9F12F117FAFD.jpeg 6511F2F6-4F55-4D4E-AE21-E428DF6E6DA2.jpeg

    Bottom Line
    While this cell has a useless large 40A “max” current rating on the wrap it has accurate continuous current and capacity ratings. In fact, the current rating is conservative compared to other wrappers of similar China-manufactured cells. This is great to see! It helps to improve safety, performance, and cell life.

    I am thrilled that the continuous discharge rating (CDR) is mentioned on the wrap but I hate seeing the use of a “max” current rating, particularly when it’s printed a lot larger than the CDR. I hope Imren removes the max rating soon.

    The two cells I tested delivered 3785mAh and 3919mAh at 0.5A down to 2.5V.

    These cells performed well, essentially equal to the Golisi S35 and Efest purple 35A 3700mAh 21700’s.

    I am estimating this Imren’s ratings at 25A and 3750mAh.

    Two cells were donated for the purposes of testing by Liion Wholesale (Liion Wholesale Batteries | Li-ion battery/cell distributor). Thank you!

    Continuous Current Discharge Graphs

    Ratings Graphic

    Performance Specs
    - DC Internal Resistance = 14.9mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 10.9Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 20A continuous = 9.0Wh (Watt-hours) average

    I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon.

    Imren paid a fee to be moved to the front of the testing queue, which currently has a 10-12 week backlog. This cannot influence my test results as they pay in advance, have no say about what is in this report, and I don’t care if any company never does this or donates batteries again. My reputation is a lot more important than any battery donation or payment.

    To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
    • Like Like x 4
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
    I'm seeing a trend in the positive direction with the labeling of these re-wraps that I would like to imagine you are at least partly responsible for.

    • Like Like x 2
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