Imren Gold 30A 3000mAh 18650 Bench Test Results...a ridiculously overrated battery

Discussion in 'Batteries and Chargers' started by Mooch, Nov 26, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    The two cells tested were donated by The Vapor Emporium (Vaping Accessories, Kits, Liquids & Batteries - New Market, Maryland) for the purposes of testing. Thank you! To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18350, 18650, 26650, etc.

    While the test results are hard data, the conclusions and recommendations I make based on these tests are only my personal opinion based on my criteria for setting a rating. Carefully research any cell you are considering using before purchasing.

    Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them.

    If the cell has only one current rating number on it, or if it says "max discharging current" then I have to assume that the company is stating that the cell can be discharged at that current level in any way, including continuously.

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    Bottom Line
    This is a ridiculously overrated 15A battery that I am rating at 19A 3000mAh because of its low operating temperature compared to other batteries. It's great that it doesn't have the useless "pulse" rating in large numbers on the wrap but its claimed 30A continuous rating is a huge disappointment. The Imren Gold 20A 2500mAh cell was accurately rated. I don't know why they decided to exaggerate the current rating so much with this cell.

    Perhaps it's due to a misreading of the datasheet for the cell they rewrapped? This Imren looks and performs identically to the Sony VTC6 (but this can change at any time). As clearly shown in the VTC6 datasheet, it is rated at 30A only if you stop when the temperature reaches 80°C. Since this battery gets hot enough to boil water when discharged continuously at 30A this cannot be a 30A-rated battery.

    I am giving it a Maximum Vaping Amps (MVA) rating of 25A. The 18650 ratings table has been updated to include this cell.


    Continuous-Current Test Results
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    Pulse-Current Test Results
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    Performance Compared to the VTC6
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    VTC6 Specs
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    Comments
    • At 10A continuous it reached 2819mAh. This is about average performance for a 3000mAh cell at 10A so I am rating it at 3000mAh.
    • At 15A continuous the temperature rose to 68°C. This is below the average temperature of a cell operating at its continuous discharge rating (CDR). This is an indication that we are operating below its true rating.
    • At 20A continuous the temperature rose to 81°C, just above the average temperature of a cell operating at its CDR. This is an indication that we are operating very near its true rating.
    • At 25A continuous the temperature rose to 93°C, this is above the average temperature of a cell operating at its CDR and is an indication that we are operating at above its true rating.
    • At 30A continuous the temperature rose to 105°C, above my 100°C safety limit. This is an indication that we are operating far above its true rating. The voltage is sagging a lot too. This is clearly not a 30A cell.
    • I am setting a CDR of 19A for this cell. While operating any cell near its rated maximum current level causes damage to the cell, I would expect good cycle life from this cell at 19A continuous.
    To see how other cells have tested and how hard you can safely push them, check out these links:
    List of Battery Tests | E-Cigarette Forum
    https://www.e-cigarette-forum.com/f...afety-grades-and-pulse-performance-data.7566/
    https://www.e-cigarette-forum.com/f...des-picking-a-safe-battery-to-vape-with.7447/
    https://www.e-cigarette-forum.com/f...fety-grades-and-pulse-performance-data.7554//
     
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    Ho Ho Ho chemical burns for Xmas kiddies!
    [​IMG]
     
    KenD and Mooch like this.
  3. Barkuti

    Barkuti Senior Member ECF Veteran

    May 3, 2016
    Do you usually evaluate a pair of cells in your tests Mooch?
    I only see curves for a single battery in your charts… am I missing something? :)
    Consistency can be of importance, critical for in-series setups.
    Do you remember HKJ's test of the Gpower 25A 2600mAh? Awful consistency! As if the rewrapping/packaging machine got halted and refilled with some other random cells in a hurry… :eek:

    Cheers :)
     
  4. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Check the first line of my post above. :)
    If I see more than a 2% difference between the two cells I post those results and stop the testing, they're too inconsistent. If they are within 2% of each other I continue the tests but only post one set of curves as only one set is needed (since they're consistent) and it makes reading the graphs considerably easier.
     
    KenD likes this.
  5. Barkuti

    Barkuti Senior Member ECF Veteran

    May 3, 2016
    Thanks for the explanation. Of course I see/knew your reviews always start with the plural word “cells”, but it dawned on me that the graphs only had “single” curves.

    Thanks and cheers :D
     

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