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Battery %

Discussion in 'Phantom 2 Discussion' started by 2trickpony, Mar 5, 2014.

  1. 2trickpony

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    Well, I had a scary flight yesterday.
    I was flying approx 400m away and approx 90m high and decided that it was time to fly home as the battery was at 30%
    Upon rotating to home direction and giving it some throttle the battery percentage dropped right down to 5% !!!
    The P2 didnt go in to RTH or Failsafe or anything else, it let me fligh home and land, no problem.
    By the time it landed the iosd gave a reading of 0% :?

    I am hoping this is a one-off but has anyone else experienced this issue?
     
  2. goldfishrock

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    Very scary! I wonder if the IOSD was misreporting the true voltage. Certainly when the voltage drops low there isn't enough power to get it in the air so for it to be 5% would be very unusual. Was the drop sudden....i.e. 30% straight to 5%?
     
  3. EMCSQUAR

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    I question the acuracy of the IOSD mini - I think there is a delay the further out you get. (at least what I've observed) "Trick" didn't you do the 1.5 convert? I did and my IOSD reads voltage not % - this was battery test I did recently -> http://www.youtube.com/watch?v=1fu3CWOSlmw

    "ElG.." is resident expert on battery stuff hopefully he'll chime in.
     
  4. 2trickpony

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    Yes, thats exactly what happend 30% straight to 5%, no in-between reading.
     
  5. 2trickpony

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    My iosd gives me battery voltage AND %
     
  6. ianwood

    ianwood Taco Wrangler
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    Yes, but it appears the OSD computes the percentage from the voltage which isn't as accurate as getting the percentage from the battery controller.
     
  7. 2trickpony

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    I see, thanks for the heads up Ian.
     
  8. goldfishrock

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    That figures! It explains why I don't get to see the battery warning lights until my IOSD is reporting 27% :)

    Thanks for clarifying that Ian :)