OpenTX Automatic 4s or 6s Audible Radio Flight Battery Warnings

In this OpenTX video I show you how to set up audible low battery warnings in your TX when using 2 different size batteries. Some pilots use both 4s and 6s batteries on the same drone OpenTX will select which battery you are using and give you the low voltage callout when nessaccary.
Thanks to Chris Young for pointing me in the right direction.
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/ billclark

[@HeliZero]

Thanks BC, very useful function and OTX is very powerful. Keep up the good work - i love your videos.

[@mr.j9232]

U smart sir..

[@rrenegadoo]

I got lost at 2:06, in the logical switches, Lo1....a>x...."A1"??... what is A1?.... Thank you.

[@the-happy-RC-flyer]

A1 is the telemetry sensor for the receiver I was using at the time. You will need to check your sensor names by discovering new sensor.

[@Johow]

Hey Bill - Great Video! Thank you. I have the new DJI O3 Air unit on my quad. At this time the O3 air unit does not put out battery voltage in the goggles. (known issue) I can show the battery voltage on my T16S EdgeTX display. But I am waering my goggles and can't see the display during flight. Is there a way that I can get battery voltage call outs like every 10 seconds or on certain threshholds? Thank you very much.

[@the-happy-RC-flyer]

This video should help you
ruclips.net/video/ur1lnFTR884/видео.html

[@jcruz372]

I have been trying to do this with my radio and was not able until I found your video. Your video shows the settings for 2 battery types. Can this same method be used for 3 battery types? I have a model template I use to setup my RC and I use 2s, 3s and 4s. I modified the settings to accomodate 3s and 4s but not able to set for 3 battery types. Could you respond back and advise how to add an additional battery to this setup?

[@the-happy-RC-flyer]

You need to add another logical switch for the third battery you will need to check the voltages allow the switches to work correctly. I say this because of higher voltage differences between 4s and 6s.

[@davidsebbag1695]

1 question Bill if i may, how do I know that my radio is fully charged? only by the light on the power switch off after fully charged?

[@the-happy-RC-flyer]

Hi David, best thing to do is check your radio screen they seem to be fairly accurate in my experience. Also make sure your radio is set up to give low radio battery warnings it should be by default. I think you would have to be very unlucky to lose a model because of low radio battery these days. Hear the warning and land! 😊

[@iiianydayiii]

Assuming battery voltage is calibrated correctly in betaflight (and you're using betaflight), could the Bat% sensor be used? if so, this could be accomplished w/ one logical switch.

[@the-happy-RC-flyer]

Hi Jake, I do not think so.

[@iiianydayiii]

@@the-happy-RC-flyer I believe you're right. I had good, repeatable results on my 4s quad but those same settings didn't work w/ my 6s.

[@the-happy-RC-flyer]

@@iiianydayiii I will need to check the settings.