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What to do with this battery? After a crash :-(

Discussion in 'Pro/Adv Discussion' started by RudydG, Dec 28, 2015.

  1. RudydG

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    I bought a P3A second hand, with 2 good batterys (i thought)
    After some flights, i had a major crash, drone just lost all power. Props and gimbal broken.
    Gimbal is repaired, i have a 3D printer, and could print the broken gimbal arms, and of course a new cable.
    I don't have a receipt, so warranty was at least "difficult", and i repaired it myself, now i am on my own ;-)
    Battery was 100% on start, 98% on crash, less then a flight minute later.

    The complete log is here:

    HealthyDrones.com - Innovative flight data analysis that matters


    I could see that this battery gave many critical errors.

    Also a log of another flight (no crash, but still questionable):

    HealthyDrones.com - Innovative flight data analysis that matters

    My 2 other batteries are fine, no errors there.

    The crash happened the day before the new firmware came out. Unlucky me probably. Seems this is the solution for these errors.

    Now i am in doubt to use this battery anymore. But it is almost like new. But would the new firmware not take care of this problem? (oh yes, forgot, i also discharged it until 8%, did not cure the errors)
    I flew a couple of times with this battery since the repair, everything seems fine.

    What would you people do?

    Greetings and a happy newyear!
     
    #1 RudydG, Dec 28, 2015
    Last edited: Dec 28, 2015
  2. Keith Lampman

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    I'll give you $25 for the old battery
     
  3. Mark The Droner

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    Personally, I would deep discharge the questionable battery, recharge it, take a look at the cell disparity, and then decide whether to retire it or keep it.
     
  4. WetDog

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    I don't get it. According to the 'general' section of HD, your battery started out at 100%, ended up at 98%. According the detailed cell analysis, your battery started out below 3.4 V which is the usual STOPPING point for LiPO battery use. Did you start flying on a nearly dead battery?
     
  5. RudydG

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    Battery is like new. Was fully charged night before. Also, no errors during take of or this short flight. And the voltage was only so low on that 1 flight. My later flights all gave "normal" readouts, but still with critical errors.
    I am also puzzled.
     
  6. WetDog

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    That is weird. If I understand the Healthy Drones log, you STARTED OUT with a dramatically flat battery (that another sensor reading interpreted at '100%'. Your rather short, eventful flight makes perfect sense in light of the low voltages. I would also think the HD would flag those voltages in some way.\

    Confused as usual.
     
  7. RudydG

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    Yes, it seems that way, but i never knew that it was so low, for me it was fully charged, bird gave me ready to fly GPS,(after warming up IMU), and battery was 100% on screen. no sign whatever, not on screen, not in the lights, nothing. So strange.
    And in the log you can even see the battery starting so low! Why did it never gave a warning (i flew at 100% up and 100% to the front), what i always did in the past, with P2 and now P3.

    And i only knew about this whole situation, after the crash, and only then i learned about the healthydrone site, otherwise, i would still not be aware of the battery fault.

    My biggest problem now is, i lost confidence, which i always had in the past, my P2 never gave me such problems.
     
  8. RudydG

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    I did this (1 time down to 8%), but still get critical errors in healthydrones analyses. no problem on dji go app. (but that was also not the case during the crash)
     
  9. RudydG

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    Update,

    As i have no clue what happened, why on earth 100-98% on the display, while the voltage drops below 3V!!!, and the fact that i still get critical errors on that battery, checked with healthydrones, i decided to retire that battery, buy a new one, and enjoy flying again.
    If i can revive the battery, meaning no more critical errors in the logs, i will use it again.

    Greetings,

    Rudy
     
  10. MattyDread

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    Sell it to Keith - then he will have 16 batteries