Flat Battery Before Flight – Warning – Part II

This is well known, useful alarm for Jeti, found on various forum’s in the world wide wait. There might be times when the original way does not work, for example if you use beep-codes on transmitter or it takes time before your voltage-sensors value is stabilized. This method allows more control on timing. That is why this is Part II, original method is presented here.

It happens really easy that You connect a empty or half-empty battery to Your model and go flying. This ends rarely in happy feelings so why not create an alarm for it.

What we need is a way to monitor battery-voltage only a few moments after plugging it in. We can’t keep this alarm active the whole time since the alarm-threshold needs to be relatively high.


Make a telemetry-control that activates when battery-voltage is for example over 5 volts:

Power up your receiver, it needs to be on when you program this sequencer. Make a sequence (For me it’s Q1) that is active (100%) only briefly after a time that suits your needs, define the switch as the telemetry control You just did (for me that was MX4 as seen above)

Make sure in the Advanced-side to choose”Asymmetrical” and “Always finish the sequence”

Now we need to make a Logical Switch. Set Control 1 to the just created sequencer, in my example Q1. Set condition as “X > 10”. No Control 2 or condition is needed.

Remember, the Control 1 needs to be centralize and proportional!

Make a another telemetry-control, choose the threshold as  “cell-count x 4.1”. This means that if the battery’s cell-voltage is lower than 4.1 volts (LiPo) we judge it as used and not fully charged. Remember to choose right condition “X <” also put the duration as 0.2 seconds.

For this telemetry control define the switch as the logical Switch you just made (For me in this case L1).

Lastly define a warning for this in “Sounds on event”, the activating switch is the second telemetry control You made.

Extra safety when using LiPo’s is never a bad thing, this also prolong’s the life-expectancy of Your batteries :)

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