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Talk to me about battery care

Discussion in 'General Discussion' started by phantomoftheopera, Feb 6, 2014.

  1. phantomoftheopera

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    I always read about people adjusting low voltage alarms, checking individual cell voltage immediately after flights, etc.

    Can someone give me a rundown of proper battery care or point me in the direction of a good tutorial?

    My main questions are:

    What is the interaction between the Assistant Software and the battery alarms?
    What is the appropriate voltage to drain a battery to?
    What is a good voltage checker?

    Any other advice?

    Thanks!
     
  2. reALIGNed

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    Location:
    S.E. Wisconsin
  3. phantomoftheopera

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    Thanks for the link! I have been reading a lot lately.

    I still have a question regarding setting the First Level Protection setting in the Naza Assistant. How do I determine the voltage to put as the No Load First Level Protection trigger?

    I understand you never want to take out more than 80% of the voltage or get lower than roughly 3.6 volts per cell.

    If I have the Mad Dog 2700mAh battery how would I calculate the No Load voltage?

    Thanks in advance!
     
  4. socman

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    the mAH does not matter...its how many cells you are using. In your case, all batteries you use to power your phantom are 3 cell. 4.2V per cell is fully charged (or 12.4V per pack). If you use the 80% rule, you do not want your pack dropping below 9.9V....or 3.3V per cell (assuming all cells are balanced).
    So having your first protection at 3.6V per cell (or 10.8V as a pack) is actually not a bad idea to keep it at. That way you have time to get it landed and such.
     
  5. ElGuano

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    Small arithmetic niggle- full pack charge is 12.6v, not 12.4. Also, it's not preferred to think about percentages in voltage. Voltage drop is non-linear, particularly near the beginning and end of the discharge curve. 3.3v per cell is not 20% charge remaining, at constant runtime and drain. Once it drops to 3.0 at load, it really falls off a cliff. Iirc I put 20% closer to 3.57-3.58v/cell loaded.