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Thread: Panasonic 3100 mAh voltage vs capacity

  1. #1
    Flashaholic
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    Default Panasonic 3100 mAh voltage vs capacity

    This is the capacity chart that I am using:
    4.2V = 100%
    4.1V = about 90%
    4.0V = about 80%
    3.9V = about 60%
    3.8V = about 40%
    3.7V = about 20%
    3.6V = empty
    <3.5V = over-discharged

    But, I was told that with the new Panasonic 3100mAh cells, 3.6v cells still have around 40% capacity remaining. What would a new capacity chart, representing 3100 mAh cells look like?

  2. #2
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    Default Re: Panasonic 3100 mAh voltage vs capacity

    After reading around for a bit, I've concluded that, for anything using the NCR18650 3100 mAh cell (i.e. AW, Callies, Redilast, Eagletac), voltage below 2.5v would be overdischarged, and ~2.8 volts should be considered empty. So, it would be safe to wait for the cell to drop to 3.2-3.4v before recharging.

    Sidenote: I know that it is better to frequently top off cells instead of doing a deep charge on them, but it's nice to know what the cells can be safely run down to.








    Source: http://industrial.panasonic.com/www-data/pdf2/ACA4000/ACA4000CE240.pdf
    Cutoff stated is 2.5v

    "(3) Discharge Termination VoltageNNP series 2.5V per cell (2.75V per cell in the case of 2 series or more)
    PSS and Cobalt acid series 3.0V per cell
    Avoid discharging at voltages less than these."
    http://industrial.panasonic.com/www-...ACA4000PE1.pdf
    Last edited by aimxplode; 03-02-2012 at 09:05 PM.

  3. #3
    Flashaholic* jasonck08's Avatar
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    Default Re: Panasonic 3100 mAh voltage vs capacity

    Quote Originally Posted by aimxplode View Post
    This is the capacity chart that I am using:
    4.2V = 100%
    4.1V = about 90%
    4.0V = about 80%
    3.9V = about 60%
    3.8V = about 40%
    3.7V = about 20%
    3.6V = empty
    <3.5V = over-discharged

    But, I was told that with the new Panasonic 3100mAh cells, 3.6v cells still have around 40% capacity remaining. What would a new capacity chart, representing 3100 mAh cells look like?
    About 1Ah capacity left @ 3.6v. So ~30%. Depending on the discharge current the cells should generally rebound after 10 minutes to about 3.2v+.

    The 2.5v is the minimum voltage underload. I would say that about 3.2-3.3v idle voltage is about 0%, but its always better to recharge sooner rather than later...

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