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Identifying Protection in 18650 Li-ion Cells from Dell Vostro and Asus Eee PC Batteries

marcingebus 8748 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16230438
    marcingebus
    Level 11  
    I have such links as in the pictures. I will make / modify the power supply for portable lamps and small sound equipment. All links are about 66mm long + 1mm or less, plus tab. And now the questions are, do these links have overcharge and over-discharge protection or not? I am asking because the headlamp, which has a power input, has some electronics and during discharge it probably went below 2.5V, and during charging (released at night), it was 4.15V.

    Gray cell removed from the original Dell Vostro Battery.
    Light blue cell in the original Asus Eee PC Battery,
    Double blue cell - Chinese work lamp.
    Attachments:
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    #2 16230462
    goldi74
    Level 43  
    Laptops certainly do not have built-in protection, for this is the electronics in the battery. The double ones - it's hard to say, you can't see what's under the shirt except the links.
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  • #3 16230507
    marcingebus
    Level 11  
    And with the length that they are 66mm it is not clear that they have no protection. Because either they have this simple power supply and reception system is OK and you do not need to do anything, or it is not OK and something should be remedied.
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    #4 16230654
    goldi74
    Level 43  
    If the whole package is 66 mm long, it is unlikely to have electronic protection.
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    #5 16230687
    Freddy
    Level 43  
    marcingebus wrote:
    And now the questions are, do these links have overcharge and over-discharge protection or not?
    Is it so difficult to enter the symbol yourself in Google to see the exact parameters?
    They do not have built-in security (gray ones), this package in blue, it is not known what it is.
    It's just that LGDAS31865 and LR1865SE are different cells and they cannot be combined into packages.
  • #6 16230847
    marcingebus
    Level 11  
    Freddy wrote:
    marcingebus wrote:
    And now the questions are, do these links have overcharge and over-discharge protection or not?
    Is it so difficult to enter the symbol yourself in Google to see the exact parameters?
    They do not have built-in security (gray ones), this package in blue, it is not known what it is.
    It's just that LGDAS31865 and LR1865SE are different cells and they cannot be combined into packages.


    My problem was that here:
    http://nazya.com/product/akkumulyator-18650-ls-18650-lr1865se-2200mah-3c_45190309403.html
    they show here with a capacity of 2200mAh

    And here it reads 1400mAh:
    http://www.batteryonestop.com/baotongusa/products/datasheets/li-ion/LR1865BE-1400.pdf

    And here I don't know which position is the one I'm looking for.

    I measure them with the LC2100 meter and for me 500mAh capacity 2345mAh (two batteries welded together), 3143 (two), 2710 (two). I know it is tickling, because 250mA per cell where nominally is over 1A, but I did such tests first.
    ------------
    I confess blue I did not throw in my uncle, and here the answers are easier.
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    #7 16231474
    Freddy
    Level 43  
    Have you noticed that there is a different battery symbol in the second link?
    The first one is correct.
    marcingebus wrote:
    I measure them with a LC2100 meter and 500mAh
    They may already be damaged.
    Note that these batteries normally have high 3C discharge currents, but only have 300 charge cycles.
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Topic summary

The discussion revolves around the identification of overcharge and over-discharge protection in 18650 Li-ion cells extracted from Dell Vostro and Asus Eee PC batteries. Users express uncertainty regarding the presence of electronic protection in these cells, particularly given their dimensions of approximately 66mm. Responses indicate that typical laptop batteries lack built-in protection, as this is usually managed by the battery's electronics. The conversation also touches on the confusion regarding the specifications of different battery models, with users noting discrepancies in capacity ratings and the potential for damage to the cells. The importance of understanding the specifications and limitations of these batteries is emphasized, particularly in relation to their discharge rates and cycle life.
Summary generated by the language model.
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