Simple to use Lipoly low voltage alarm that is small and light for on board use, plug's into balance lead for detecting low voltage on individual cells. A loud alarm will sound and LED will change from Green to Red if any individual cell drops to 3.3v or below.
Spec. Lipoly Range: 2s~4s Size: 38x25x11mm Weight: 7g Voltage Accuracy: 0.03v Low Voltage Alarm Threshold: 3.3v (per cell)
In order to transmit the voltage to the radio, the radio and the receiver need to be telemetry capable. If they are telemetry capable, you won't need this to report the voltage, but you need sensors. If you happen to have Turnigy 9XR and FrSky D8R-II Plus, you can make a voltage sensor yourself, all you need is two resistors and connect it to A2 pin (this was just an example).
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I love this smal alarm system. Easy to fit and very safe. After connetion, it check every cell of your Lipo and the horn will be activated for a second. It is very loud and a nice working tool for more saftey.