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How to tell if the handset batteries are getting low?

Discussion in 'Phantom FC40 Discussion' started by houldsworth1, Oct 11, 2014.

  1. houldsworth1

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    I had a crash earlier which was caused by my unit suddenly behaving very oddly and not responding to the controls properly.

    I was wondering if it might be because the batteries in the controller (the thing with the joysticks) are getting a little old. However I have flown with it since and everything seems OK again.

    Is there some kind of warning that the 4 batteries need replacing ? If not, how often do people change theirs to avoid having problems mid-flight?

    TIA

    Barry
     
  2. Mandrake

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    There's an audible warning on my FC40 radio .. No idea at what voltage it goes off at .. Left the radio switched on one day and heard the alarm a couple of hours later...
     
  3. houldsworth1

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    Perfect! Just what I needed. Thanks
     
  4. kitari

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    I actually made a video not too long ago to show people what happens when your batteries get low. Also once it started beeping, I had plenty of time to get the phantom back in and even fly around quite a bit and there was still battery life left.

    [youtube]https://www.youtube.com/watch?v=f4D6djJkw2E[/youtube]
     
  5. varangian

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    Thanks for the video. I knew the transmitter had a flashing light warning, didn't know that it had an audible on also. Handy if you're flying and not paying attention to the transmitter.
     
  6. houldsworth1

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    Great! That's exactly what I needed to know. Can't miss that!!! :)
     
  7. 4wd

    4wd

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    That's actually just to tell you it's been left on, however the low battery warning is similar and can't be missed.
    It will still work for a while after it starts giving the low battery warning on and off and it should't make any difference if it starts during a flight.