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Cylaid 25A 2200mAh 18650 Bench Test accurately rated 25A battery

Discussion in 'Batteries and Chargers' started by Mooch, Apr 28, 2017.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18350, 18650, 20700/21700, 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" 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_5170.JPG IMG_5171.JPG IMG_5172.JPG IMG_5173.JPG

    Bottom Line
    This Cylaid is a true 25A cell that performs well and appears to be a Sony VTC rewrap.

    While this cell has the 25A continuous current rating in small print on the wrap it has a useless 40A "max pulse discharge" rating on the wrap too. It also features "40A" in a larger font which many people will use as the cell's rating when shopping or when a vendor displays it on their web site. For these reasons I feel the large "40A" rating, or any "pulse" rating, is misleading and shouldn't be used.

    It has the distinct Sony VTC top contact structure but uses a venting disk that doesn't match any VTC venting disk I've seen before. This Cylaid cell doesn't match the performance of any VTC cell I've tested before either.

    It tests out better than the VTC4 but worse than the VTC5A. I don't know which cell they might be rewrapping.

    I am rating this Cylaid at 25A and 2200mAh.

    My thanks to Cylaid for donating the two cells for testing! (Shenzhen Cylaid Technology Co., Ltd. - Electronic products,E-cigarette)

    Continuous-Current Test Results

    Pulse-Current Test Results
    IMG_5177.PNG IMG_5176.PNG

    Comparison to Sony VTC's

    Always Remember
    ⁃ There is no 18650 with a factory/manufacturer rating over 30A continuous.
    - There is no 3000mAh 18650 that can have a rating over 20A continuous.
    ⁃ There is no 3100mAh-3600mAh 18650 that can have a rating over 10A continuous.
    ⁃ There is no 18650 available to vapers that has a capacity rating over 3600mAh.

    • At 10A continuous this cell delivered 1949mAh. This is below average performance for a 2200mAh cell but just within limits so I am rating it at 2200mAh. There is a possibility that this is a 2100mAh cell with an average capacity. Without more evidence of this though I will always default to the battery company's rating if it's within permissible limits.
    • Its temperature of 76°C at 25A continuous is just below the average for cells being operated at their rating so I am rating this cell at 25A.
    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
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