Samsung 35E 3500mAh 18650 Bench Test Results...a so-so 8A battery

Discussion in 'Batteries and Chargers' started by Mooch, Nov 7, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These cells were purchased with funds donated by the vaping community 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 battery has a very high 3500mAh capacity rating but even at just 5A its run time down to 3.2V is a lot shorter than the 3300mAh Panasonic NCR18650GA. Its high internal resistance causes a lot of voltage sag which triggers a regulated mod's weak battery alert sooner than batteries like the NCR19650GA and MJ1. I am rating it at 8A/3500mAh. My maximum vaping amps (MVA) rating is 13A but at anything over 10A or so there is a lot of battery sag.

    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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    Comments
    • At 5A continuous it reached about 3126mAh. This is about average performance for a 3500mAh cell at 5A so I am rating it at 3500mAh.
    • At 10A continuous the temperature rose to 74°C. This is just below the average temperature of a cell operating at its continuous discharge rating (CDR) but there is significant voltage sag. This is an indication that we are operating at above its true rating.
    • At 15A continuous the temperature rose to 109°C. This is above my 100°C safety limit and, along with the severe voltage sag, shows that this cell is being operated at far above its true rating.
    • I am setting a CDR of 8A 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 8A 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//
     

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