Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

P3p battery 8% discharge

Discussion in 'Pro/Adv Discussion' started by bodine, Nov 8, 2015.

  1. bodine

    Joined:
    Aug 25, 2013
    Messages:
    27
    Likes Received:
    4
    I have 3 P3p batteries approaching 20 cycles.
    Read several posts about DEEP discharge process...Pro's and Con's. ..
    I've used lipos for many years in land RC vehicles. ...Never took a Lipo below 3.4 volts per cell....So My Question is DEEP DISCHARGE
    or NOT?????

    Guess I'd really like your Current opinions


    THANKS Guys!!!
     
  2. happydays

    Joined:
    Jul 5, 2013
    Messages:
    1,858
    Likes Received:
    663
    Location:
    Warrenpoint, Ireland
    What does the manufacturer recommend? It's in the manual
     
  3. bodine

    Joined:
    Aug 25, 2013
    Messages:
    27
    Likes Received:
    4
    Yes I've READ THE battery Guide. .
    Thanks!!!
     
  4. tcope

    Joined:
    Jan 29, 2015
    Messages:
    3,556
    Likes Received:
    1,401
    Location:
    Salt Lake City, UT
    Look below and you will see several threads giving everyone's opinion on this matter.
     
  5. msinger

    Approved Vendor

    Joined:
    Oct 30, 2014
    Messages:
    19,117
    Likes Received:
    5,632
    Location:
    US
    bodine, yes, you should do it since DJI recommends it. Disregard whatever other information you've read about non-DJI lipos.
     
    Chris P Duck and bodine like this.
  6. El Diablo

    Joined:
    Aug 14, 2015
    Messages:
    22
    Likes Received:
    7
    Location:
    Somewhere Above, WI
    Discharging to 8% improves state of charge readings if a full charge is done afterwards. Charge monitoring circuits (built into the battery, not the P3) are just not accurate enough without periodic calibration. Deep discharge does nothing to improve the real storage capacity of the new (P3 type) Phantom batteries. Deep discharge may degrade storage capacity depending on several dependent and independent factors. Having accurate battery capacity readings is important for safe flying of the Phantom. DJI recommends to do deep discharges at regular intervals (20), so I will. I figure anyone that can design something that can fly so well must know how to charge, measure, draw and discharge their batteries. I fly my P3A to 10%, land it, remove props and run to 8% after about every 20 cycles.
     
    #6 El Diablo, Nov 21, 2015
    Last edited: Nov 21, 2015
  7. Flyingoak

    Joined:
    Sep 14, 2015
    Messages:
    28
    Likes Received:
    6
    Location:
    Yorkshire, UK
    Where is that recommended?
    AFAICS the manual describes how to discharge to 8% but does not when or why.
     
  8. Flyingoak

    Joined:
    Sep 14, 2015
    Messages:
    28
    Likes Received:
    6
    Location:
    Yorkshire, UK
    OK, I've found it now - it's in the battery guidelines rather than the main user manual.
     
  9. N017RW

    Joined:
    May 2, 2014
    Messages:
    6,257
    Likes Received:
    1,619
    Location:
    Palm Beach Co.- FL
    Every 20 cycles.

    This is NOT flights or the number of times you have attached the charger to the battery but rater another calculation within the 'intelligent' battery interface.
     
  10. El Diablo

    Joined:
    Aug 14, 2015
    Messages:
    22
    Likes Received:
    7
    Location:
    Somewhere Above, WI
    I agree. It is cycles, not flights. But I always start with a full battery and fly it until about 30%. Waiting to recharge until shortly before I fly again. So in my case - about the same.
     
    bobmyers likes this.
  11. bobmyers

    Joined:
    May 10, 2015
    Messages:
    3,611
    Likes Received:
    866
    Location:
    San Antonio, TX
    I am recycling tonight and just for everyone's information the latest app 2.4.1 apparently will stop the motors when the batteries reach 10%. This is sitting the P3 on the bench and running them down at idle to reach the 8% level.(without the props)

    I had deep cycled two batteries about a month ago sitting on the bench to 8% and I had to shut the motors off when they reached 8% so apparently that change occurred in a software upgrade-- probably the last.
     
  12. Ptr

    Ptr

    Joined:
    Oct 7, 2015
    Messages:
    248
    Likes Received:
    61
    Currently can't fly, your opinion also would be great, I have a P3p don't know really why as the A is a beauty as well, can shoot 4k but can't play back on anything, question is you paid a lot of money for your bird & do you think it will always be with you, will it or you fail, kinda like preventative measures, opinion is divided with me as 1 day I know she will leave me, be it by my hand or hers, as far as batteries go its me that needs to deep cycle
     
  13. MattyDread

    Joined:
    Jun 23, 2015
    Messages:
    328
    Likes Received:
    108
    Location:
    Canberra - Australia
    My 1st battery is on 40cycles & all the cells are spot on, 100% battery life - in your opinion would you deep cycle it?

    I did it at 20cycles as the cells were way off & it corrected it
     
  14. FCPhantom

    Joined:
    Mar 23, 2014
    Messages:
    168
    Likes Received:
    27
    Location:
    Finland
    When the battery reach 0%, the cell voltage is 3.5V. So it is safe to deep cycle your battery.
     
  15. alokbhargava

    Joined:
    Sep 28, 2015
    Messages:
    5,158
    Likes Received:
    1,665
    Location:
    San Francisco, CA
    Deep discharging after 20 cycles is a good practice but don't leave the battery in discharged state for long. It is advised to put it to charging again immediately to full.