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Help! LiPo voltages at different stages ?

Discussion in 'Giant / Scale RC General Discussions' started by Snoopy1, Aug 7, 2019.

   
  1. Snoopy1

    Snoopy1 640cc Uber Pimp

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    OK have question on LiPo. Yes we all know max voltage is 4.20 volts, storage is 3.85 volts and minimum is 3.2 volts for me.
    Ok 3.85 volts is for storage. But what voltage is acceptable to leave a LiPo at for say 5 days and NOT do any damage. Or do you need to always bring it down to 3.85 volts .
    Some times I will only get time to do one flight on my second plane that I bring to the field and will still have say 4.1 volts left would you leave the pack at that voltage for 5 days and just bring back it to full charge the days you go flying again.
     
  2. acerc

    acerc 640cc Uber Pimp

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    I don't discharge mine between in season flights but my season is all year long. I also do not charge at a high rate, typically 1 amp, and I also replace them annually. Hmmm, maybe I am not best suited for responding to your question. My understanding is that Li-Po has a "number of cycles" life and any charge no matter how small is a cycle. So if there is enough juice for a flight or two the next time out I'll burn those flights before recharging.
     
    Last edited: Aug 7, 2019
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  3. Snoopy1

    Snoopy1 640cc Uber Pimp

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    That is an interesting thought. And yes I have read it several times they have a number of cycles and then it is over. But I thought that was from full to empty.
    Same as you always charge at 1c or less most times my charge is set at 1 to 2 amps.
     
  4. acerc

    acerc 640cc Uber Pimp

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    The little Tundra hardly ever gets both batteries depleted on the same day, occasionally not even the same week.
     
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  5. Snoopy1

    Snoopy1 640cc Uber Pimp

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    Thanks for input it is always nice to know how others are doing things successfully.
     
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  6. Sometimes I charge at 12c. Almost always charge at least 5c. Most of my batteries are several years old and some of them have over 200 cycles. Only thing I’ve found that kills them is storing long term at full charge.
     
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  7. Snoopy1

    Snoopy1 640cc Uber Pimp

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    I agree at full voltage does ruin them quickly. But does storing them at 4.1 volts, does that damage the battery or not . That is what we are trying to figure out or is there a curve to the deterioration.
     
  8. MarkF

    MarkF New to GSN!

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    From the moment lipos are made they start to deteriorate. The higher the voltage the worst it gets. Now leaving them at full charge for a week or so is fine. What can be worst is leaving them under 3.7 volts. If your cells sit at a low SOC they can begin to puff. Remember 80% is 3.75 per cell. Discharging to less than that is damage to your cells and 3.2 is a death sentence. After you land, your resting voltage is what matters and not your cut off, but if your under 3.7 then your pre maturely killing your pack and that is what make packs have short cycle life. 4.1 is not as bad as low voltage but ok if for just a short while.
     
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  10. Jetpainter

    Jetpainter 640cc Uber Pimp

    Is this a typo? From everything I've read, 80% is like 4.06 volts and 3.75 volts would be about 40% just wondering.
     
    Last edited: Aug 8, 2019
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