Zippy 40C 1800mAh 3S LiPo Pack Bench Test Results...only a 17C/28C pack, but an ok one

Discussion in 'Batteries and Chargers' started by Mooch, Mar 22, 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, 26650, LiPo pouch, 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 or packs 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 or pack 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.

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    Bottom Line
    This Zippy is a ok performing pack but it is overrated.

    Vaping at its 72A (40C) rating, which I am presuming is a useless "pulse" rating and not a continuous current rating, would quickly bring the pack voltage down to about 10V and quickly heat the pack up past the Zippy's max temperature rating unless vaping slowly. This cannot even be considered a 40C (72A) pulse-rated pack unless the pulses are short and far between and you don't mind the huge voltage sag at 72A.

    CAUTION: LiPo's use the most volatile of the Li-Ion battery chemistries and can cause extreme injury if abused. Never use a LiPo unless the cells, wraps, wiring, and connector are in perfect condition. Never exceed the CDR of the LiPo unless you understand and accept the risks involved. You are responsible for your own safety, be careful!


    My Ratings
    Capacity = 1800mAh
    Continuous Discharge Rating (CDR) = 30A (17C)
    Maximum Vaping Amps rating (MVA) = 50A (28C)
    MaxSafe rating = 60A
    Average Pack IR = 18.6 mOhms
    Average Cell IR = 4.8 mOhms
    Dimensions/Weight = 107 x 36 x 21mm / 149gms

    IR = Internal Resistance
    mOhms = milliohms


    Continuous-Current Test Results
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    Pulse-Current Test Results
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    Comments
    CDR = Continuous Discharge Rating. The nearest 5A-multiple of constant-current continuous discharge current that brings the inner cell of a 3S pack to a temperature of 60°C. This is what the LiPo assemblers recommend as the max running temperature so it makes sense to use it as the rating. Especially since the inner cell will be hotter internally than this temperature, perhaps considerably.

    MVA = Maximum Vaping Amps rating. To help prevent overheating during chain vaping and for a safety margin in case of mod malfunction, don't exceed the MVA rating. It helps to limit the pack temperature to 60°C or lower.

    MaxSafe = Maximum Safety Amps rating. To help prevent the possibility of venting or thermal runaway in case of a mod malfunction or accidental button press never go over the MaxSafe rating. It helps to limit the pack temperature to 80°C or lower. The pack can still be damaged, perhaps permanently, at this temperature though.


    Links
    LiPo ratings table: LiPo Pack Safety Grades and Performance Table | E-Cigarette Forum

    To see how other packs and 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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