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Capacity test

  • firethorn Saturday, November 9, 2013 11:21 AM Reply
    The following is a capacity measurement for these cells.

    All cells charged (~1A) individually and then discharged (1A) individually with the imax b6 charger. Discharge cutoff at 3V.

    1832mAh
    1777mAh
    1754mAh
    1753mAh
    1743mAh
    1631mAh

    Ignoring both extremes, the grouping seems to be pretty tight. I would have loved 100mAh or more but it's still pretty tolerable for the price.

    Compared to sku.5790, these are obviously better.
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  • firethorn Monday, November 11, 2013 6:44 AM Reply
    Found 6 more in my battery stash and another 6 more from a recent order. All are "recently purchased". I put quotation marks so you can account for the standard dx delivery time.

    The following is the capacity measurements for 6 of them. The remaining 6 will come later.

    All testing done in the same manner as always.

    2022mAh
    1901mAh (Originally read at 1400mAh. 1901 is after recharging then trying again)
    1892mAh
    1886mAh
    1748mAh
    1623mAh

    Yet again, a severely "diminished" cell "recovered" after a charging cycle. I'm not sure why this is happening. The only thing that might make sense is that there is a problem with the CV charging/saturation charge stage. The numbers more or less add up. I do occasionally (though rarely) stop/pause a charging cycle for various reasons.

    For the above reason I'm gonna conclude that the grouping is within expectations. And using the method that desolder pointed out to me (paralleling all 4V, 8V and 12V cells respectively), on average this would produce about a 1.8Ah pack (x2). This is fine for my needs.
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    post edited by firethorn on 11/11/2013 at 6:51 AM
  • desolder Top 10 Forum Poster Monday, November 11, 2013 12:31 PM Reply
    Yet again, a severely "diminished" cell "recovered" after a charging cycle. I'm not sure why this is happening.

    I have always read that new Li-ion cells don't need cycling in order to reach full capacity, which is unlike Ni-xx based cells, which need 3 to 5 cycles to reach peak capacity. But every now and again I'll hear of someone needing to cycle their li-ion cells, so it makes me wonder. Anyway, thanks for the results again.
    What's up with the scrubbed LED driver IC markings?
    What are they trying to hide?

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  • firethorn Wednesday, November 13, 2013 6:15 AM Reply
    Welcome.

    And....

    Results for the last batch of 6.

    1774mAh
    1870mAh
    1920mAh
    1963mAh (this is 1 of the 2 cells that gave a "proper" capacity straight away)
    1973mAh (this is 1 of the 2 cells that gave a "proper" capacity straight away)
    2015mAh

    I had about 4 cells needing to go through this cycle to get "proper" capacities. 1 of those 4 needed to go through it twice.
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  • gasbag11 Top 10 Forum Poster Wednesday, November 13, 2013 6:27 AM Reply
    It was great of you to go to all the bother to post your results here. Info. like that is always appreciated. I gave you a few points as a thank you. :)
    NO! I don't know why DX screwed up the site so badly.
    Ask them.
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  • firethorn Thursday, November 14, 2013 9:05 AM Reply
    Not a problem.

    I've had a lot of help by reading threads like these and thought I could contribute. :)

    Thanks for the tips. :)
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