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Bench Test Results: Samsung 40T 21700…a great 30A 3900mAh battery, better than NCR20700A

Discussion in 'Batteries and Chargers' started by Mooch, Dec 12, 2017.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    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 only says "max" 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.

    IMG_1377.JPG IMG_1378.JPG IMG_1379.JPG IMG_1380.JPG


    Bottom Line
    This test was done only as a preview of a cell that should be available by the middle of 2018. It is just a guide so vapers and mod manufacturers know what’s coming and can make more informed purchasing or manufacturing decisions.

    This is a fantastic performing true 30A cell that easily beats the Sanyo NCR20700A at both high and low discharge current levels. At moderate power levels this Samsung 40T even beats the incredible Samsung 30T, hitting harder for almost the entire discharge down to 3.2V and for a lot longer too.

    At high power levels though the lower internal resistance of the Samsung 30T allows it to hit harder than the Samsung 40T for most of the discharge down to 3.2V (about 3.6V resting voltage). The 40T still runs for longer though.

    This is a classic tradeoff, the 30T’s higher performance and current rating versus the 40T’s higher capacity. The 40T still performs better than the Sanyo NCR20700A and would be an amazing cell for high power regulated vaping. Even for mech’s if the 30T wasn’t available.

    This cell delivered 3962mAh and 3985mAh in my capacity tests. Judging by Samsung’s “40T” designation for it I am sure its nominal/typical capacity rating will be 4000mAh. However, its guaranteed/minimum rating is always lower than the typical/nominal rating and will probably be 3800mAh or 3900mAh.

    I am rating this Samsung at 30A and 3900mAh.

    Two cells were donated for the purposes of testing by Enercig (www.enercig.com). Thank you!


    Continuous-Current Test Results
    Samsung 40T Capacity Tests.jpg Samsung 40T CC Tests.jpg


    Pulse-Current Test Results
    Samsung 40T Pulse Tests.jpg Samsung 40T Pulse Tests ZOOMED.png


    Comparison to Samsung 30T and Sanyo NCR20700A
    Samsung 40T CC Tests Comparisons.jpg


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