How to tell if the handset batteries are getting low?

[houldsworth1]

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

 

[Mandrake]

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...

 

[houldsworth1]

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...

Perfect! Just what I needed. Thanks

 

[kitari]

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]

 

[varangian]

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.

 

[houldsworth1]

Great! That's exactly what I needed to know. Can't miss that!!!

 

[4wd]

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...

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.